Grodan Delta 4 Block 3 in x 3 in x 2.5 in w/ Hole

Grodan stonewool (rockwool) is made from molten rock spun into cotton candy-like fibers and then compressed into cubes, blocks, or slabs. While other stonewool brands cut all sizes from the same batch of wool, Grodan is unique in that it manufactures different types of fiber. The purpose is to meet the plant's requirements at each stage of development. Grodan has an enormous capacity to absorb nutrient solution and, at the same time, retain enough oxygen for rapid growth. Grodan comes in gradual sizes. Seedlings started in cubes are easily transferred to blocks and then to slabs, if desired. Seedlings or cuttings started in Grodan cubes can also be transplanted into more traditional pots and growing media.

Grodan Blocks - Grodan Delta blocks are the most uniform on the market. They feature improved grooves at the base for better drainage. They are available in a wide assortment of sizes and configurations to suit all types of plants. These growing blocks are used for direct sowing or for "blocking on" plants raised in Macro and Multiblock. AO 36/40 plugs fit well into the holes in the blocks. The blocks can then be placed on a slab to provide a larger growing volume. Hugo is the largest of the growing blocks. It provides enough volume to support a larger plant, so it does not need to be placed on a slab.

8 blocks per strip, 48 strips per case.

Technical Data Sheet

• Dimensions: 3 in x 3 in x 2.5 in | Grodan Delta Series
• Pre-cut hole for easy insertion of propagation plug or seedling
• Reduced block size, ideal for seedlings and cuttings in early propagation
• Balanced water and air retention for good root initiation
• Transfers to larger Grodan blocks or slabs at transplanting

Instructions for use

• Soak in pH-adjusted water (5.5–6.0) for 1 hour before inserting seedling or plug
• Place the rooted propagation plug into the pre-cut hole
• Water with a light nutrient solution of EC 0.5–1.5 mS/cm during initial growth
• Transplant to a larger block or pot when roots emerge from the base of the block
• Do not reuse rockwool: dispose of it properly at the end of each growing cycle