Gro Market Report: Sales Volume, Market Share, Leading Brands & Market Trends

VEGAMOUR is the best-performing gro brand in July 2026, moving 6,900 units across 5 ASINs for 50.0% of Top 10 volume. California Naturals follows with 4,000 units (29.0%), ahead of Dyna-Gro on 2,900 units (21.0%).

With 3 brands splitting the Top 10 and 100.0% of volume sitting with three of them, this is a concentrated shelf — the leaders hold multiple listings or one very high-velocity ASIN, so a new entrant competes against established review moats rather than an open field. Average selling prices among the leaders run from $21.75 to $42.80, which frames the price band a competing listing has to justify.

Based on July 2026 data, this shortlist surfaces the two kinds of ASIN worth keeping an eye on — the ones that just broke into the Top 10, and the ones growing fastest month over month. Specifically, one ASIN forced its way in: B003SUT6VS booked 1K units at $18.49, with ▲ 11.1% MoM change. On the growth side, B0049XISGM leads positive momentum with ▲ 100.0% MoM growth on 200 units, with B0FN4H6WVV close behind at ▲ 33.3% MoM on 400 units.

The two signals carry different weight. A fresh entrant means share has already changed hands — an incumbent gave up its place to make room, so any competitive set drawn up a month ago is now out of date. A steep growth rate works as the earlier warning: it marks demand that is still compounding, usually a month or two before the ranking catches up to it.