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The sturdy deep green base is grooved to create a reservoir for water so that the planting block floats. The clear fitted top includes ventilation slots you can keep closed or open to desired size. Very durable and attractive, this unit fits all size planting blocks (the 60-cell, 40-cell, and 18-cell) and is the perfect size for placement on a heat mat. The base measures 14 7/8" long x 9 1/2" wide x 2 1/4" high, while the clear top measures 14 7/8" long x 9 1/2" wide x 4 1/2" high.

Constructed of heavy-duty Styrofoam, this planting block has 40 large holes to hold the bio sponges, plus smaller holes between the cells to increase aeration within the unit. Lightweight but very long-lasting, the unit features tapered cells (wider at the top than at the base) with slight grooves to accommodate the bio sponges.

These generously sized plugs are 1 3/8" wide x 2 1/2" deep. Each is pre-drilled with a hole at the top, and tapers from a wide top to a narrow base. This growing medium is well-aerated and encourages root growth downward, instead of spiraling. At transplant time, simply plant the whole bio sponge! Set of 40.

Boasting an NPK of 20-20-20, this water-soluble blue formulation helps seedlings grow their best and healthiest! We use it in our greenhouses, and you will love it in your Bio Dome! 1-ounce packet.

An all-natural growth enhancer you spray right onto the foliage of your plants for better branching, greener leaves, and heavier flowering and fruiting! It contains no chemicals or artificial ingredients, so the organic gardener will love it too. A single pouch makes 250 gallons of solution.

Giant 4-inch blooms are fully double and unbelievably bright! No sun-loving annual is easier to grow than marigold, and this Whopper is the biggest and best of the bunch! Pkt is 25 seeds.

All-natural and environmentally friendly, these wooden tags are smooth enough to label every plant in the garden, and can be reused or tossed into th compost pile at season's end and recycled! Set of 50.