Park's Original Bio Dome with 18 Whopper Cells

18-Cell Original
Item #96064


The biggest yet — it could only be a whopper

Giant 3-inch-long, 1 3/4-inch-wide cells grow huge, healthy plants!

A Park Seed Exclusive!

Love the Bio Dome but need larger individual growing cells? This new 18-cell Dome was created just for you! The same size base tray and dome as our original 60-cell and 40-cell versions, this version contains a planting block with 18 huge cells, each ready to hold extra-large seed, cuttings to be rooted, or bigger, more mature seedlings!

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.

This Whopper version of the Bio Dome is great for all kinds of seeds, plus cuttings you want to root. Refills of the bio sponges and the polystyrene block are available (though unless you step on it or something, the polystyrene block will probably never wear out! It's pretty tough).

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 a cutting of your favorite Geranium at season's end, rely on the Whopper Bio Dome. You'll be glad you did -- we stake our good name on it!

Product consists of:
Bio Dome (green bottom tray and vented clear plastic top)
Planting block
18 Bio sponges
Seedling food
Complete instructions

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
Whopper planting cells measure: 1 3/4" wide x 3" deep

Get growing today with the Whopper Bio Dome, and you will begin to see the biggest, healthiest seedlings of your gardening career!


Skip Product Specs
Item Form Accessories
Color Original
Size 18-Cell
Restrictions *Due to state restrictions we cannot ship to the following:
Canada, Guam, Puerto Rico, Virgin Islands

Product Review Summary

Based on 6 reviews
The average rating for this product is 5 out of 5 stars
Overall Rating: 5.0/5.0

Customer Reviews

February 05, 2020

Great Product for starting/raising tomatoes and peppers

This shopper rated the product 5 out of 5 stars

I now have 3 bio-domes. They are fantastic for getting the seeds going quickly, and they usually work all the way up to planting time. I have some cow-pots that I can transfer to if the plants get too large from maybe an extended winter. I like it!

Anne from OK
April 14, 2019

great for larger seedlings

This shopper rated the product 5 out of 5 stars

I have two 40 cell domes and two 18 call domes. I prefer the 18 cell biome for larger plants - my tomatoes , eggplant and zinnias grow to a nice large size before I pop them into 4 inch pots. Yes the plants get too tall to keep the top on but once they are that tall they do well without the dome top Most of my seeds germinate within a few days- and I have about 90% germination ( with some seed types, 100%) under my grow lights The initial investment is high, but these can be used for years with great success.

Giovanna from NY
February 19, 2018

Best Product I've Ever Used for Growing Poppies from Seed

This shopper rated the product 5 out of 5 stars

I bought this to grow poppies from seed. I have tried many other products for doing this. This product had by far the best germination rate and grew the best and strongest plants with very substantial root development. Once I planted my poppies in the ground they really took off. I used this for California poppies, Shirley poppies, and Oriental poppies. As a bonus, so far... the squirrels do not seem interested in digging up the sponges after I planted them.

Mel from CA
August 02, 2013

Best investment

This shopper rated the product 5 out of 5 stars

All good! Biodome is the best gardening investment I ever made!

Pete from TX
April 21, 2012

Great quality, simple to use, awesome results.

This shopper rated the product 5 out of 5 stars

Great product, not a flimsy plastic throw-away. Plants love it. Simple to use, starts a great root system. I would purchase a taller dome for cloning if they offered one...

George from NJ

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