GROW!T Commercial Coco, RapidRIZE Block 8"x8"x6", case of 20

Fast-Expanding Coco Blocks Sized for Large Flowering Plants, 8x8x6in

A pre-mixed growing medium only saves time on transplant day if it actually arrives ready to plant, and loose bagged coir still needs measuring and mixing before it goes into a container. GROW!T's RapidRIZE blocks skip that step: each block starts from the same indoor-processed, lab-tested, buffered coco coir as the rest of the GROW!T Commercial Coco line, but arrives pre-formed and compressed so it expands directly into a usable transplant medium once it's saturated with water.

This larger 8x8x6in size, sold 20 blocks to a case, gives more established or heavier-feeding plants a bigger root volume than the 6x6x4in size, making it a better match for late-stage flowering plants nearing full size.

Key Features & Benefits

• 8x8x6in block size — sized for large flowering plants, 20 blocks per case
• Compressed for storage — expands fully in about a minute once saturated with water
• Low-profile, wide shape — matches the rooting pattern of herbaceous annual plants better than a tall, narrow block
• Lab tested, buffered coir — low ppm and EC allows same-day nutrient application after expansion
• Stackable format — combines with smaller RapidRIZE block sizes for staged transplanting

Who Should Use These Blocks

Growers finishing out large flowering plants who need more root volume per block than a mid-size format provides, and who want the same lab-tested, buffered coco base across their whole operation.

About GROW!T

GROW!T is a Hydrofarm exclusive brand covering coco coir in loose bags, compressed blocks, and commercial-scale RapidRIZE formats, along with graded perlite and clay pebbles for soilless and hydroponic growing.

Frequently Asked Questions

How long do RapidRIZE blocks take to expand?

A fully saturated block expands to its finished size in about a minute. There's no overnight soak or multi-hour wait before it's ready to receive a transplant.

What size cases are RapidRIZE blocks available in?

GROW!T offers RapidRIZE blocks in a 6x6x4in format packed 40 to a case and an 8x8x6in format packed 20 to a case, so growers can match block volume to plant size and container spacing. Both sizes come from the same lab-tested, buffered coco coir base.

Can these blocks be stacked or combined with other sizes?

Yes, smaller and larger RapidRIZE blocks can be stacked together or planted into within the same growing area. That flexibility lets a grower stage plants from a smaller starter block into a larger finishing block without switching media types.

Is this coir tested for contaminants?

Yes, every batch is processed indoors and lab tested for heavy metals before shipping. The same washing and buffering process used across the GROW!T Commercial Coco line applies to every RapidRIZE block.

How should I saturate a block before transplanting?

Set the compressed block in a tray and add water until it's fully saturated, then let it sit for about a minute to expand completely before inserting a transplant. Avoid transplanting into a block that's only partially expanded, since the root zone won't be uniformly hydrated yet.