Is Pargro on Sale? November 2026

Questions and answers

What is Pargro rockwool best used for?

Pargro slabs and blocks suit hydroponic crops such as tomatoes, peppers, cucumbers and strawberries, and the pre-cut holes make transplanting rooted blocks quick. The dense slab holds moisture while draining freely, which keeps the root zone steady between irrigation cycles.

How does the Pargro Biggie differ from a standard slab?

The Biggie is a larger block format used to build a bigger root volume before or instead of a slab, often for longer crops or larger plants. Standard slabs are flatter and wider, so choose by the root volume and footprint your system needs.

Does Pargro rockwool need to be conditioned before planting?

Yes. Rockwool is alkaline out of the bag, so soak and rinse the slab or block with a nutrient solution adjusted to your target pH before planting. Check the runoff pH and adjust until it settles near where you want it.

What size are the pre-cut holes on the Pargro slab?

The 36 x 8 x 3 inch slab has three pre-cut holes sized to take standard rockwool blocks, so you can drop rooted blocks straight in. Confirm the block size you use fits the hole before ordering.

Is Pargro rockwool reusable?

It can be reused for a second short crop if you clear old roots and sanitize it, but the fibers compress and water-holding changes over time. Most growers replace slabs each crop for consistent irrigation and fewer root disease problems.

Are there Pargro discount codes?

Deal.ai checks what Pargro products actually cost at every store, so a real markdown shows on this page as a deal as soon as it starts, and each product's page has its price history to tell a sale from its usual price.