Park's Original Bio Dome with 40 Jumbo Cells

40-Cell Original
Item #06456


This "mini greenhouse" lets you control climate and conditions for best germination

Bigger, healthier, better-rooted seedlings every time -- the easy way!

A Park Seed Exclusive!

Park's Original 60-cell Bio Dome Seed Starter has revolutionized indoor seed-starting. Now we're proud to introduce the larger version of this mini-greenhouse, with wider, deeper cells for even bigger and better-rooted seedlings!

When we say that this seed-starting system from Europe is revolutionary, we really mean it! Now you can start your favorite vegetables and flowers indoors, for earlier crops at a fraction of the cost of buying plants. And you can select the varieties YOU want (not the half-dozen choices the local garden center picked out), confident that with Park's Bio Dome with 40 Jumbo Cells, your seeds will sprout and your sprouts will transplant easily into the garden.

This little powerhouse from Holland bears almost no resemblance to other seed kits, which tend to produce spindly sprouts with curled-up roots and limp stems. The seedlings in Park's Bio Dome with 40 Jumbo Cells grow to a uniform height and width, thanks to the spacious distance between each growing cell. And our growing medium -- the Bio Sponge -- encourages root growth downward, NOT in an upward spiral that eventually strangles the plant! With the Bio Dome, you place only one seed in each Bio Sponge, which really helps stretch out today's smaller seed-count packets.

The only seeds unsuitable for this Bio Dome are very large ones -- and those belong in our 18-cell Bio Dome, which is also useful for rooting cuttings and growing seedlings extra large before transplanting. Root vegetables such as carrots, beets, and radishes need space to grow their tuber, so they are best direct-sown. But everything else, from petunias to tomatoes, belongs right in these bio sponges, where they get the perfect blend of aeration and support.

Before and after germination, your seeds receive just as much light, water, heat, and air circulation as you choose, thanks to the adjustable vents and bottom-tray watering design of the Bio Dome. This environment offers such great growth conditions to the emerging seedlings that Bio Dome plants are usually ready to transplant a bit quicker than other seedlings -- and they suffer virtually no transplant shock in the garden.

Product consists of:
Park's Original Bio Dome
Jumbo Planting Block
40 Jumbo Bio Sponges
1 Packet of our own seedling food (to be dissolved in the watering tray at the base of the Dome)

Green base measures: 14 7/8" long x 9 1/2" wide x 2 1/4" high
Clear top measures: 14 7/8" long x 9 1/2" wide x 4 1/2" high
Jumbo planting cells measure: 1 3/8" wide x 2 1/2" deep

You will love this seed-starting system, and your garden will show the beautiful results!

If you're new to using the Bio Dome, let us sing the praises of this, our most POPULAR PRODUCT OF ALL TIME. Customers love it, and even experienced seed starters like us, who have been dropping Marigold seeds into the soil since pre-school, have come to make the Bio Dome the ONLY SEED STARTING SYSTEM WE NEED. Here's why:

Climate Control: you can remove the clear vent as the plants grow, but at first, especially if you're starting seeds in late winter, it's a real boost of warmth and humidity! And the two adjustable vents at the top make sure that your plants get good air circulation at all times.

Incredible Rooting Medium: in each hole of the polystyrene planting tray is what we call a "bio sponge," a pre-formed plug of sterile medium with a hole already drilled in the top. The bio sponge is simply the best way we've ever found to reliably germinate and grow on seeds. We plant 1 -- ONLY ONE -- seed in each bio sponge, even for difficult-to-germ varieties, and they nearly always sprout. (The only seeds you don't want to grow in the Bio Dome are those of root vegetables like carrots, beets, and radishes -- they need more space to grow their tuber than the bio sponge allows.) In all our years, we've just never had results like this from any other seed-starting medium, and we've tried them all twice. The bio sponge offers the perfect blend of aeration and moisture to help seeds of all kinds grow and cuttings to root!

Bottom Watering: you water the base of this tray, NOT the bio sponges themselves. Put enough lukewarm water into the base so that the polystyrene tray floats. The bio sponges will wick up just the water they need. And as your plants grow, their roots will go down and out, instead of spiraling or fanning out near the surface as you often see with top-watered seedlings. It's impossible to over-water the Bio Dome!

Root Strength: this goes along with #3 -- these seedlings form LOTS of roots and grow them straight down and out, so that when it comes time to transplant the seedling, you can see roots sticking out all over the sides and bottom of the bio sponge!

Ease of Transplant: none of this business of transplanting the plug into a pot and then transplanting the plant out of the pot and into the soil! When you start your seeds in the Bio Dome, they can be transplanted straight into their final home. The bio sponge holds together, but the roots fan out easily beyond the sponge and into the garden or container soil.

Refills of the bio sponges and the polystyrene block are available so you can use your Bio Dome for years to come. Starting the Bio Dome is mess-free, easy, and so economical. Whether you want to start your entire garden indoors at winter's end or you just have to root your favorite Geranium at season's end, rely on the Bio Dome! You'll be glad you did -- we stake our good name on it!


Skip Product Specs
Item Form Accessories
Color Original
Size 40-Cell
Restrictions *Due to state restrictions we cannot ship to the following:
Canada, Guam, Puerto Rico, Virgin Islands

Product Review Summary

Based on 18 reviews
The average rating for this product is 5 out of 5 stars
Overall Rating: 5.0/5.0

Customer Reviews

April 14, 2020

I like the compact and ease of the Bio dome.

This shopper rated the product 5 out of 5 stars

After a week some.. seeds are starting to sprout that where put directly into the pods. Still waiting on others to germinate. Not sure why some are and some are not, they seem to be the smaller seeds they suggest to put on the top of the pods that are slow in spouting. Still I like the convenience of the Bio Dome as the Northeast has long winters and this is a great help to get my garden started.

Sue from NH
April 03, 2020

Great starter!

This shopper rated the product 5 out of 5 stars

I purchased this after reviewing a bunch of other kits and decided on it because it looked solid. The sponges make it a whole lot neater too. So I just got it and started my tomato seeds. The kit is awesome. It is not flimsy. It is contained. The styrofoam sponge holders are perfect and the sponges are not dried out like some other brands out there. My seeds have already stated to crack and it has just been a few says. The system keeps the seeds and sponges moist. I’m hoping for strong seedlings.

Chris from MA
March 23, 2020

Awesome way to Garden

This shopper rated the product 5 out of 5 stars

This is my first purchase with Parkseed, and I'm thrilled with the 40 Jumbo Cell BIODOME I recently purchased! Within days, my seedlings are growing! I'm so glad I found this product. It's well-made, easy to use, and shipped in record time!

Janan from MN
March 02, 2020

1st time grower

This shopper rated the product 4 out of 5 stars

This unit is well constructed, delivered on time, came with easy to follow information. I am amazed at capabilities too start seeds. 1 week in the dome, with heat and I have 75% germination. I also am trying a cheaper version (brand)with similar setup and am very disappointed in the results. “Parks you have my vote” great system and I look forward to continued business with you.

Dave S from WI
January 29, 2020

Amazing success

This shopper rated the product 5 out of 5 stars

I have tried other and similar seed starter kits, with only moderate success, often with complete failure. I could wait weeks for sprouts to start. I bought a 40 cell Bio Dome, along with a heating mat, Parks seed starting solution, and an LED light. I have had sprouts in 24 hours. Leaves showing in 48. As I write this it is the second day since I planted and 23 cells have sprouts. I am amazed at the success so far.

Mitch from FL

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