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The dome consists of a sturdy green plastic tray with a clear fitted top boasting two adjustable vents for better control of air circulation and interior temperature. The base of the tray is grooved for a reservoir, and the entire unit is very strong and long-lasting. It accommodates the planting block of any size Bio Dome: the 60-cell and 40-cell as well as this Whopper 18-cell! Base: 14 7/8" long x 9 1/2" wide x 2 1/4" high. Clear dome: 14 7/8" long x 9 1/2" wide x 4 1/2" high.

Durable and long-lasting, this Styrofoam block contains 18 holes, each wider at the top than at the base, that accommodate the 3-inch-long, 1-inch diameter bio sponges. The planting block is designed to float on the reservoir, with plant roots emerging from the bottom of the block as the seedlings grow. Smaller holes between the planting cells improve air circulation.

Our largest bio sponges, the Whoppers are 1 inches in diameter (at the top) and 3 inches long. Pre-drilled with a planting hole at the top, the sponges taper to the base, encouraging roots to grow downward rather than spiraling. Plant the entire sponge in garden or container when the seedlings have at least 2 sets of true leaves. Set of 18.

With a 20-20-20 NPK, this formulation is designed to jump-start seedling growth from the very first day! Water-soluble granular formula, the same used in our own greenhoses here at Park. 1-ounce packet.