Grodan Pro MM 40/40 6/15 Plugs 1.5" - Single

Grodan Pro MM is a stone wool propagation plug made for consistent propagation and early root development in controlled grow environments. As a stone wool propagation plug and rockwool starter plug, it’s built to give young plants a stable, uniform start without the variability that can slow rooting or create uneven batches.

This plug is designed around greater steering possibilities, so the root zone stays responsive as conditions shift. That matters when you’re managing a busy propagation space and want starts to stay uniform across a tray instead of drifting into “wet here, dry there” performance. Grodan Pro MM supports responsive control of water content and EC, helping you keep early-stage conditions more consistent while plants establish.

Early root development is the focus, and Grodan Pro MM is built to support faster rooting-in. A faster rooting-in plug helps plants establish sooner, which can translate into more even starts and less time managing weak or lagging plants. As roots expand, the plug is designed to encourage roots making better use of the entire substrate volume, supporting a more complete root footprint rather than a tight root ball that underuses the media.

As roots make better use of the entire substrate volume, the plug supports stronger water and nutrient uptake from the media. That improved uptake potential is especially valuable during propagation, where small differences in rooting speed can quickly turn into big differences in plant size and readiness. The goal here is simple: keep batches more uniform, make early plant handling easier, and support a smoother transition from propagation into the next stage of growth.

Grodan Pro MM is a good fit for growers who want a consistent propagation plug for controlled grow environments, with greater steering possibilities, faster rooting-in, and responsive control of water content and EC to support uniform early root development.