Hydrogel in Pots: When It Helps and When It Rots

Hydrogel is a polymer that absorbs water and releases it when the substrate dries. In an attic in August, it's gold. In a shady patio in November, it's a trap for rotten roots.

How to Mix It

Hydrate it first in a basin. The dry granules next to the root swell and push the root ball against the pot wall. Mix the already expanded gel with coconut, perlite, or soil, never in a single bag at the bottom.

Typical dosage: a few grams of dry gel per liter of substrate, according to the label. More is not better: the plant “floats” in gel and does not seek soil.

Crops That Appreciate It

Tomato in 25 L, pepper, geranium in the sun, strawberry planters. Less sense in cacti, lavender, and rosemary: they want to dry out between waterings. In seedbeds, avoid it: excess water is the first mold.

Watering After the Gel

Space out waterings and check the weight of the pot. The surface substrate may appear dry while the gel below remains saturated. A toothpick or finger at 5 cm prevents drowning.

What We Recommend at Control Garden

Water-retaining hydrogel in 1 kg, 5 kg, and 10 kg. Start with the small format, measure the effect in 2-3 pots, and then scale up.