Compared across 2 stores. Prices are checked against each store and labelled with when.
It checks today's price at every store, compares the alternatives and answers in about a minute.
These are 50 one-inch rockwool starter cubes cut as a single sheet, made from spun basalt rock. Rockwool holds water and air well and starts seeds in a sterile medium, which suits hydroponic setups and soilless germination. The cubes are uniform in size, so they drop into standard net pots and trays without trimming. Compared with peat pellets or coco plugs, rockwool wicks nutrient solution faster and keeps its shape when wet, but it stays alkaline until pre-soaked and does not break down, so it is a one-season starter rather than a reusable plug.
In stockSold by SparkMrtReturns: Sold by a Walmart Marketplace seller; returns go to the seller under the seller's returns policy.
Availability unknown
As an Amazon Associate, Deal.ai earns from qualifying purchases.
Store links may earn us a commission.
Lowest price we've seen: $4.59 on Nov 14 at Amazon. Tracked across 1 store since Nov 14.
These starter cubes are made from 100% rockwool, which is derived from natural basalt rock fibers. The material provides a sterile, disease-free environment for starting seeds in hydroponic and soilless setups. Each cube has a pre-drilled hole for the seed.
The fiber density and structure absorb water quickly and hold nutrient solution. Air pockets in the material let oxygen reach the roots.
When seedlings are ready to move, the whole cube can be transplanted into a larger rockwool block or directly into a net pot. This keeps root disturbance low. The 50 cubes come joined together as one sheet.
