Plant tools

Calculators that answer with real numbers, from real horticultural data — no sign-up, nothing stored.

Whether to repot at all, the right next pot size, and how much of each component to mix — in cups.

The right mix for your species, scaled to your pot and adjusted for what you already have in the garage.

Your USDA zone from ten years of recorded low temperatures at your coordinates, plus your frost dates.

When to put tender plants out, and the deadline for bringing them back in.

Estimate your indoor humidity from local conditions and see which plants would struggle at that level.