Bio Dome Refill Sponges

Bio Dome Refill Sponges
Bio Dome Refill Sponges

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3.65 (43)
Plant a New Crop in Your Bio Dome with these Bio Sponges
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Ships in 1-2 business days

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  • Buy 2 for $17.96 each and save 10%
  • Buy 2 for $12.56 each and save 10%
  • Buy 2 for $9.86 each and save 10%

Description / Bio Dome Refill Sponges

Your Bio Planting Block will last a lifetime with these handy, economical Bio Sponges. When you're ready to begin a new crop in the Planting Block, first be sure that the block has been thoroughly disinfected (warm water with a splash of bleach is fine). Then soak the Bio Sponges you intend to use in warm water for a few minutes. They expand, revealing the pre-drilled planting hole at one end. Simply slip one seed into the hole of each Bio Sponge, place the Sponge seed-side-up in the cell of the Planting Block, and you're on your way to another bumper crop of healthy, strong, super-quick seedlings.

Bio Sponges are comprised of a combination of coconut coir, peat moss, and bio char and are now enriched with oilseed extract, giving your seedlings an extra boost of nutrition. You'll love the results!

3 different sizes available for replacement in the Park?s Original Bio Dome Seed-Starting System and we have Bio Dome Planting Blocks and Sponges also available.

Product Details

SKU v1597
Shipping Method Restrictions none

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Customer Reviews

3.7

43 reviews

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Top customer reviews

  1. Heidi

    Great replacement for Aerogarden sponges 4 people found this helpful

    Rating

    I have several AeroGardens and have been using these for a few years. They are great replacements. And since Aerogarden is going out of business I am happy to have found these.

    Response from store

    We're happy you found us too!
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  2. Xebache

    Overpriced 6 people found this helpful

    Rating

    For what it is it's way overpriced and the sponges with shipping a very very expensive. I own 2 whopper, 1 jumbo,1 standard sized unit. I have nothing against them but COST. WYSIWYG - plastic basin, Styrofoam block, transparent plastic lid with plastic sliding vents and sponges. The vents fall off constantly, the Styrofoam is far from substantial. I bought mine years ago and have no real complaints until I went to order more whopper cell sponges. $15 on sale! Almost $10 shipping - 25 bucks for 36 peat moss plugs??? I also have invested in quality hydroponic self contained green houses at a far less cost and figure I'll just make my own for the whopper. If it was $15 with a couple dollars shipping ok ( no mass to the sponges ) common you can fill a shopping tote with seeds packets, pods, perlite and coco coir and the box would cost less then $10. How do I know - I'm disabled and have 99% of EVERYTHING shipped and delivered.
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  3. Julie

    Not biodegradable 9 people found this helpful

    Rating

    The inserts work great, but they are not biodegradable, They will not decompose, even after years in compost or soil. Since they are not reusable I wish they were less durable.
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  4. Steve Baisden

    Terrific products 1 people found this helpful

    Rating

    I have used the bio domes for years and have had unfailingly wonderful results. They were a game changer for me and since I moved to Florida where plants have to be more robust when planted out the "whopper" insert is great.
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  5. Larry Briscoe

    Best I've Tried! 1 people found this helpful

    Rating

    These sponges and the Bio Dome are the easiest and most practical way I have used to start seeds. Just place a seed into the hole on top (or place on top of the sponge in the case of the smaller clay-coated seeds). I now combine the sponges and Cowpots for my complete Seed Starter Solution! I love 'em.
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  6. Brian

    A good fit 0 people found this helpful

    Rating

    Bought these for my Aerogardens, they work well. Am happy to have found another option.
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  7. Jennifer Cohn

    Great 0 people found this helpful

    Rating

    I looked for the most reasonably priced aerogarden sponge replacements I could find. I save the plastic holders from the original sets and use my own herbs. I cover the top with foil and poke a hole in it to allow the herbs space to grow. I buy my own seeds. Much cheaper than the brand name. They work great. I've gone through one set already and am on here to purchase my second.
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  8. Robin Zordan

    great purchase 0 people found this helpful

    Rating

    easy to use. Just drop in your seeds, no use of potting soil.
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  9. Holly

    Work well and are worth it. 0 people found this helpful

    Rating

    These work very well and are worth the extra cost.
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  10. Holly

    These work well 0 people found this helpful

    Rating

    These work well in the biodomes, but can be used in other containers as well
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  11. Karen

    Happy Grower! 0 people found this helpful

    Rating

    Just what I ordered. Very satisfied with the grow sponges. Would order again. This was my 2nd order.
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  12. Cathyanne

    Verified Buyer

    PERFECT 0 people found this helpful

    Rating

    I love the Park Seed Bio-Domes. I have 16 of them and they are super for starting seeds. I am a certified Master Gardener in Idaho and grow a lot of flowers. This year I started over 400 seeds and these Bio-Domes make my life so easy. We have white carpeting (YIKES) in my seed lab and my first years I had quite the mess, trying to use small starting pots with soil. These domes keep the humidity perfect and I can watch the roots develop as well. Don't hesitate - they are seriously the best for seed starting. I tend to like the 18 plug dome over the 40. But for marigolds and zinnias the 40 are best as I grow a lot of those.
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  13. Karen

    Excellent 0 people found this helpful

    Rating

    This one is my favorite. If you are a small gardener, this size is the one to consider. Germination is pretty fast. Where I have notcied the biggest difference, is planting them out. These cells are so large that the roots are protected, and they hold a lot of moisture to protect them during transplanting.. It may seem like a waste when you pull that huge cell out with a tiny seedling inside. However, it's in the ground that you see the biggest difference. There are a lot of bugs that love fresh tender root and they can't get to them in these pods. By the time the roots are growing out of them, the plant is established and well on it's way to a happy life. One thing I did notice that improved my plants. For the first couple of days, I continued to use the nutrient solution that they were used to, before switching over to water. That made a difference.
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  14. Sue

    These sponges are tough 0 people found this helpful

    Rating

    I love the convenience of these sponge plugs. The seedlings get off to a great start. However, the sponges do not decompose or break down once planted outside. Some of my plants' roots could not break through the sponge and instead grew over the top edge of the sponge. With their roots stunted and up at the surface of the soil, they were susceptible to drying out and not getting enough nutrition from below. They did not do well. I have found sponges the following year after planting that have not decomposed even though they are in the soil.
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  15. Kim

    Not so hot 0 people found this helpful

    Rating

    I purchased the bio-dome with these sponges. I followed the directions, very few seeds sprouted, what seeds did sprout they didn't do well in these sponges they were thin and weak plants and the roots couldn't even grow in the sponges. I transplanted all of the seedlings into dirt and most of them just died. The ones that remained were very stunted and took about a month more to finally reach a normal height for their age. I don't think these sponge starters are any good.
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  16. Meg Counterman

    Wet! 0 people found this helpful

    Rating

    2/3 times I have ordered these they have arrived completely saturated. I don't need all 120 at once as I use 20 or 30 or so at a time. I have to spread them out and let them dry for several days of dry weather in order to store them without them molding. I am a busy single mom with enough on my hands.
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  17. Aimee

    disappointing 0 people found this helpful

    Rating

    I ordered the refill sponges for my 40 cell biodome and used them to plant my tomato seeds. The seeds sprouted fine, within the typical 7-10 day time frame. Took the cover off and within another week the seedlings began to dampen off. All but 6 seedlings died as a result. Now, I've been using plug trays for many years now and this was the first time I have had this happen. I did not change anything in regards to my indoor seed starting. I used the sponges within a few days of receiving them. At first I thought maybe the seeds were contaminated but I replanted what seeds I had left in a different plug tray and had 90% germination and they are doing very well. In addition to that I start all of my flower seeds indoors using my other plug trays and I had zero issues with damping off. So I'm not sure if the biodome sponges were contaminated or what but I won't take a chance again.
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  18. Kurtis Kadir

    Amazing Seed Starter 0 people found this helpful

    Rating

    I'm not a huge fan of rockwool as a seed starter and tried to start in Hydroton-- that didn't work out so well. These seed starting plugs work very well in a tray under a grow light which allows me to transfer the plants to my Hydroton afterwards, a real win-win for me with less environmental impact than spun basalt cubes.
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  19. Phil

    Best there is 1 people found this helpful

    Rating

    I have experimented with every seed starting method known to man. OK, slight exaggeration but in my 50+ years of vegetable gardening, I have not found anything that tops the BioDome system. It is easy to sow the seeds, it is a really clean operation, the seeds germinate quickly, and transplanting to my garden is a breeze. The germination rate for new seeds is always high - usually over 90%, and sometimes 100%. I just planted 3 varieties of tomatoes in the 40 cell dome and all 40 seeds sprouted. (I used Park seed for 2 varieties and Baker seeds for 1) The self watering system is the icing on the cake. This is the seed starting method that I will stick with.
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  20. natalie

    basically, planting plastic in your garden... 0 people found this helpful

    Rating

    I used the biodome with the sponges and with peat free seed starter to compare results. The sponge raised plants did fine but, there was a higher incident of rotting / damping off. The worst part was that they were not biodegradable or reusable so, very wasteful and irresponsible imo. I never used them again. The biodomes were great for about four years and then the tops began to crack so, more plastic - also not recyclable - to the landfill. Just not a product for today's world. I'll just use my recyclable clam-shell from the grocery as a biodome until it is ready to be recycled...
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  21. Cherie F.

    Buyer Beware 1 people found this helpful

    Rating

    I have over 30 bio domes and have always loved them... convenient, easy, and no dirt mess. Huge fan.... until now. I've always used the mega (8) sponges for starting tomatoes - I bought 3 of the mega's to use strictly for tomatoes. Yes, they talk about the bio domes lasting forever... and they certainly will last a very long time if cared for properly... however, they are absolutely NO good at all when the company stops making the sponges for the domes. I now have 3 mega bio domes that have no use at all since I can no longer get the sponges for them. So very disappointed in this company for not supporting the products they sell. How long will it be before they stop supporting the other bio domes??? I would never invest in a seed starting system without believing the company would support the product. I thought I'd be able to use this system for all my remaining gardening years - I made a HUGE investment in all these bio domes & hundreds of sponges I've purchased. Very disappointing indeed!!
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  22. Daniel L Haines

    EXCELLENT FOR HOUSEPLANTS!!! 0 people found this helpful

    Rating

    I've been using my biodome to give my houseplant cuttings a safe haven from my 3 cats. For almost a year now, I've been growing spider plants, pothos vines, and tons of African violets in my biodome from small cuttings to fully developed plants which will take the occasional munching. I simply insert the end into the growth cell and provide some water when needed. The dome does the rest! I just wish their was a 12-inch tall dome I could use for my willow tree bonsai!
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  23. paul quick

    sorry to hear you do not carry my cells any longer 0 people found this helpful

    Rating

    i have been using the 18 cell bricks over 20 years and now i can not but the refills any longer they keep sending me the tubes that need the corners all cut off to make them round and they are a mess and do not ever fit properly
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  24. CJ

    Bio Dome Sponges do not decompose 0 people found this helpful
    I ordered two of the 60-cell Bio Dome kits last year and used them early Spring 2020 to start seedlings. They worked fine for tomatoes, but everything else; bell peppers, herbs, and flowers lagged in growth after being hardened off and planted in my raised bed mix (1/3 each: compost, sphagnum peat, vermiculite) . The sponges did not allow roots to grow out and the the plants ended up slowing dying out. I pulled them out and noticed the roots were being strangled. Also, the claim that these decompose is simply not true. They are like rubber. I was disappointed in the this product and will not purchase again. I'll use the Bio Domes again but will fill with my own seed starting mix.
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  25. Lynne in CA

    Bio Dome Sponges 0 people found this helpful

    Rating

    wow, Ive used a variety of soil and seed cups etc.. I bought the small cell sponges for some smaller seeds, and I am amazed at the germination rate when using them!!... I'm ordering some more now because I am sold on them. Not only did they sprout well they rooted better than anything else Ive ever used. They also transplanted without loosing a step
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  26. Brandon

    These work great 0 people found this helpful

    Rating

    These have done a great job with germinating seeds the last 2 years that I have been using them. Nearly 100% germination rate, and I think the failure was due to the seeds and not the sponges.Will keep on using them for sure!
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  27. Pobbi

    Replacement cells yield inconsistent results 0 people found this helpful

    Rating

    When I bought Park's Bio system last year and first used it, my seed starting was improved over conventional methods available over the counter. However, this year there's been nothing but problems with bio dome replacement cells I purchased from Park. The dome units were sanitized before reusing. Seeds were from sources I've used in past without issue. Same grow lights, heat mats, etc as before. Yet this year my seedlings were feeble and spindly. One bio dome became so overwhelmed with soil gnats that all cells had to be destroyed in order to contain the outbreak. FYI, no evidence of gnats elsewhere in my home till then. As a result I am out $"s spent not only on replacement cells - but seeds and Park's blue seed starter as well. Hoping other bio-dome starts can be saved. Don't know if Park changed suppliers or what. After this year's experience, I will not repurchase their replacements.
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  28. Carol Cameron

    Use Bio Dome for growing your own flowers, herbs, and vegetables from seed 0 people found this helpful
    I'm 69 years old and I've never before grown my own flowers from seed; I always bought them already grown at the nursery. This year I decided to challenge myself and try to grow my own plants. I've been creating an English Cottage Garden/Layered Garden in our front yard here in Coastal Maine and the number of plants I need to create masses of colors that looked like an artist took a paintbrush and painted a thick swish of color is mindboggling. Also, I wanted to include all the plants I've loved and remembered over the years...almost a look back through my long life of gardening. Well. I bought 2 Bio Domes and hundreds and thousands of seeds from Park Seed and got going. WOW! Almost every seed germinated. Then, I had to transplant them into larger containers because the weather isn't right yet to set them out. This is the most fun I've had...in years and years. I'm so glad that I discovered Park Seed Company online. Carol P.S. Be careful when you reorder Bio Dome cell refills; you must buy the correct size for your Bio Dome. I accidently bought the 60 cell size and they were dwarfed in my 40-cell unit. I planted my alyssum seeds in the little cells anyway and hoped for the best. No luck. Had about 15 seeds germinate. Please don't make the same mistake I did...it cost time and money. Love! Love! Love! Park Seed Co.
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  29. Tim Gross

    Bio Dome Success 0 people found this helpful

    Rating

    Planted 62 Park's Celebrity Hybrid tomato seeds in my brand new 80 cell Bio Dome and 56 germinated. Look very healthy. Growing fast. No mess and easy to plant using Bio sponges. Going to try some pepper seeds next.
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  30. Martha

    Refills 0 people found this helpful
    Very disappointed in the last shipment of refill plugs. Several were not useable because they were disintegrating. I had several that arrived in pieces and I really believe they were in that condition before being packaged. They were not damaged during shipment because they were protected by being inside the dome. First time I have had this problem. The refill plugs are usually intact and solid.
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  31. Dianne

    New refill sponges don't fit like the original 1 people found this helpful

    Rating

    I have had success with this system for a couple of years. However, the newest refills sponges I received a couple of weeks ago are not the same as the old ones and do not fit into the dome tray like the old refill sponges. They lack the 4 vertical grooves and the bottom tip is not narrow enough to sit all the way into the tray. I guess filling the tray with more water will compensate for this. I have tried snipping the bottom edges of the sponges to taper them to fit and that allows them to sit at the same level as the old ones. I liked the old ones as they seemed made to fit. It would have been nice to know that these were different and would need modification. Hopefully they are otherwise the same and will work as well. This issue seems manageable as I like the system in general, but the change in quality without a heads up is not a faith builder.
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  32. Unhappy in Zone 6

    DON'T WASTE YOUR MONEY! 0 people found this helpful

    Rating

    Do yourself a favor and order a similar product from Amazon - at least they honor reasonable refund policies. Most of these that I put seeds in got moldy and I was using the Bio Dome along with grow lights and followed all instructions. And Park Seed said they would not refund because it was after 6 months...when I got these in the winter and couldn't even begin outdoor planting until mid-June. Horrible policy!
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  33. Julie

    Not going to use these again 0 people found this helpful

    Rating

    I spent a fortune on 4 bio domes and sponges out of the 240 sponges only a couple seeds germinated. I followed the directions to the letter but no success. The product is way too expensive to watch all of my seeds fail.
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  34. Brenda W.

    no quality control for my batch 1 people found this helpful

    Rating

    I find these things a little on the pricey side so I was very disappointed with the shipment I got this year of the small 60 count. These ones have long fibers sticking out all over, some were broken or uneven in length (long or short), plus many of them were just of low quality because the sponges had big holes in them. They just have no quality and are very disappointing.
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  35. pobbi

    Maybe more investment than I want to make 0 people found this helpful

    Rating

    Have just invested in several Biodomes but have not yet used them. Know that as soon as I do, I'll be looking for replacement starts for the next round of seedlings. So I was especially disappointed to see that they have just raised the price of replacement inserts. Rather than putting more good $'s after bad will look into returning the lot and sourcing more affordable inserts or systems elsewhere.
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  36. KY square foot gardener

    Have worked great for years 0 people found this helpful

    Rating

    quick and convenient Very easy to replant in the beds. I have kept zinnias in this medium with open biodome for weeks while I waited to see how various flowers would thrive in the garden and then replace in the bed as some planted weak plants faultered. I clean the biodome with dilutedbleach at the end of season.
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  37. Lucia

    seedlings never grew 2 people found this helpful

    Rating

    I've used the Bio Domes for about 5-6 years with great success. I used the same method this year with the same heating mat and grow lights. The germination rate was great, but the seedlings stopped growing at about an inch high. I planted more seeds in some different sponges (from the same bag) and the same thing happened. I then planted seeds in seed starting mix and they grew great. I've contact Park Seed about the problem twice, but I haven't received any response.
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  38. Kelly

    Shorted 0 people found this helpful

    Rating

    I have been using the Park Seed Biodome system for many years now. For this year's planting season I bought 2 bags of the jumbo sponges. Both bags were short. One bag had 35, not 36 and I had to leave one plug empty when I planted. I thought it was a fluke. I bought a second bag and this one only had 33 plugs instead of 36. I emailed customer service and they did not bother to respond. I have been very disappointed with my plant purchases as well this year. I have always been happy in past years, this is disappointing. I may stop purchasing from this company I once loved.
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  39. david

    Biodegradable? 0 people found this helpful

    Rating