Time for Another Crop in the 18-Cell Bio Dome!

36 Pack Refill Sponges for the 18-cell Planting Block

Pack of 36
Item # 09323-PK-36
Buy 2+ at $17.95 ea
Available to ship.

Great for rooting cuttings, starting large seeds, and growing your plants larger before transplant!

This rooting medium is intended for use with Park's Bio Dome with 18 Cells seed-starting system.
Item Form Pack of 36
Size 18-cell (Pack of 36)
Restrictions *Due to state restrictions we cannot ship to the following:
Guam, Puerto Rico, Virgin Islands, Canada
Overall Rating: 5 Stars
Average Based on 2 Reviews Write a Review
Park's Original Bio Dome with 18 Whopper Cells
Bill Gresham from WA wrote (May 04, 2013):
The Biodome works really well. I use it with the 18-cell block for any seeds that grow big fast, or which I may want to delay transplanting (for example waiting for the weather to warm up). The description of the product above is accurate except for one thing -- the polystyrene block is actually rather fragile, because the edges are too thin. Since the 18-cell block is smaller than the Jumbo and Original blocks, it could be made MUCH more sturdy and still fit well into the Biodome. Its too bad the manufacturer/designer was so greedy early on, since redesigning and retooling would cost MUCH more than the insignificant difference in cost of more styrofoam. I think Park's should pressure them to do it anyway -- it is the difference between shoddy and excellent. I would have given it five stars except for this
Whopper plugs
dennis from PA wrote (March 24, 2013):
I got the whopper bio dome these work all my seeds germinated A+

What are the differences between the various Bio Domes: 60-cell, 40-cell, and 18-cell?

The original 60-cell Bio Dome has a 60-cell planting block with 60 Bio Sponges and will produce 60 plants at one time. The 1" wide by 2 ¼" deep cells are larger than average, and a spacious 1 3/8" apart. The bio-sponges are the same size as the cells; 1" wide by 2 1/4" deep. You can grow and keep plants in the 60-cell bio-dome for 6-8 weeks before transplanting. Many varieties will just need 6 weeks until transplanting. Tomatoes and peppers would appreciate the full 8 weeks before transplanting. So, the original 60-cell bio-dome would be great for starting all of your favorite vegetable and flower seeds, with a larger number of plants produced at one time.

The 40-cell Bio Dome has a 40-cell jumbo planting block with 40 Bio Sponges and will produce 40 plants at one time. The cells are wider and deeper than the original 60-cell planting block and provide good spacing to maximize air flow. The cells are 1 1/4" wide by 2 1/2" deep. The Bio Sponges are also 1 1/4" wide by 2 1/2" deep. You can grow and keep plants in the 40-cell bio-dome for at least 6-8 weeks and some for up to 9-10 weeks, because of the wider spacing and cell/sponge size. It too would be excellent for starting all your favorite vegetable and flower seeds, with the added benefit of giving more room and time for larger plant development.

The 18-cell Bio Dome has an 18-cell whopper planting block with 18 Bio Sponges and will produce 18 plants at one time. It has the largest cells of any of the Bio Domes we offer and is great for growing extra-stocky transplants and even for rooting cuttings. The cells are 3" tall by 1 3/4" wide. The Bio Sponges are also 3" tall by 1 3/4" wide. You can grow and keep plants in the 18-cell Bio Dome for at least 8-10 weeks and some for up to 12 weeks, giving the maximum amount of growing time and spacing between plants as compared to the 60-cell and 40-cell Bio Domes. If you are looking to grow your favorite vegetable and flower seeds into large, stocky transplants for setting out in spring, then the 18-cell Bio Dome is the one you want to buy. It would be excellent for growing Tomatoes and Peppers.

How much water should be put in the Bio Dome and how often?

The beauty of the Bio Dome is that you cannot overwater! You just keep water in the tray and float the block. The larger the seedlings get, the more water they will use and you will need to add water more frequently as they grow. Initially, during germination, you may not have to water as frequently, because minimal water is being used and Bio Sponges will stay moist longer, so you may only have to water once every 1-2 weeks. Later, as plants grow and water use is greater, depending on the room temperature and the amount of light received, you may have to water more often -- possibly 1-2 times a week -- or as often as required to keep the sponges moist.