Grodan Gro-Block Improved 3" x 3" x 2.5" – 16-Pack (4 Pieces × 4) Rockwool Growing Blocks for Transplants & Hydroponics

The Grodan Gro-Block Improved 3" x 3" x 2.5" Rockwool Blocks provide a high-performance growing medium designed for strong root development and healthy plant growth. This listing includes 16 total blocks (4 pieces × 4 packs)—perfect for transplanting seedlings from smaller starter plugs or for growing larger plants in hydroponic systems.

Grodan’s improved formula offers enhanced water distribution, optimal aeration, and excellent structural consistency, ensuring even root penetration and faster growth. These blocks are commonly used as the next stage after 1.5" or 2" starter plugs, fitting seamlessly into hydroponic trays, NFT systems, flood tables, and drip irrigation setups.

Ideal for both hobby and commercial growers looking for uniform, reliable Rockwool performance.

Key Features:

• Grodan Improved Gro-Block Rockwool growing cubes

• Size: 3" x 3" x 2.5"

• Contains 16 pieces (4 blocks × 4 packs)

• Designed for transplanting seedlings and rooted clones

• Superior water retention with balanced oxygen flow

• Even root penetration for consistent plant growth

• Works with hydroponics, indoor gardens & greenhouse systems

• Perfect next step after A-OK or AOK starter plugs