Grodan Delta Blocks-100mm x 100 x 65 (4") Big Hole (bag of 10)

Grodan Delta Blocks are premium stone wool (rockwool) propagation blocks designed for consistent growth, strong root development, and seamless transplanting. This version features a big hole to accommodate large starter plugs or young plants, helping reduce transplant shock and encourage faster root expansion.

Made from spun volcanic rock and engineered for optimal water retention and aeration, these 4-inch Delta Blocks are a popular choice among professional and hobbyist growers alike for propagation and early veg stages in hydroponics or soilless setups.

Key Features

• Premium-quality stone wool propagation blocks

• Big hole fits larger starter plugs and rooted cuttings

• Excellent water retention and air porosity

• Promotes uniform growth and rapid root development

• Easy to transplant into larger grow media or systems

Usage
Place your starter plug or cutting directly into the pre-drilled big hole. Keep moist with a nutrient solution suitable for young plants. Ideal for use in trays or systems with reliable drainage.

Ideal for:
Hydroponic propagation, NFT, flood & drain, ebb & flow, coco coir transition, or any system needing clean, fast-rooting propagation blocks.