Computed August 26, 2026

Plant watering guides

Every guide computes the plant’s monthly water need for all six California climate zones from the state plant database (WUCOLS) and adopted reference climate data, then covers the signs, the method, pots and seasons. No copied care blurbs: numbers first, with sources.

Lavenderlow water (Central Valley)About 1.07 gal/sq ft in July Rosesmoderate water (Central Valley)About 2.67 gal/sq ft in July Hydrangeahigh water (Central Valley)About 4.27 gal/sq ft in July Citrus Treesmoderate water (Central Valley)About 2.67 gal/sq ft in July Rosemarylow water (Central Valley)About 1.07 gal/sq ft in July Bougainvillealow water (Central Valley)About 1.07 gal/sq ft in July Agapanthuslow water (Central Valley)About 1.07 gal/sq ft in July Azaleasmoderate water (Central Valley)About 2.67 gal/sq ft in July Camelliasmoderate water (Central Valley)About 2.67 gal/sq ft in July Gardeniasmoderate water (Central Valley)About 2.67 gal/sq ft in July Jasminemoderate water (Central Valley)About 2.67 gal/sq ft in July Geraniumslow water (Central Valley)About 1.07 gal/sq ft in July Japanese Maplemoderate water (Central Valley)About 2.67 gal/sq ft in July Olive Treeslow water (Central Valley)About 1.07 gal/sq ft in July Avocado Treesmoderate water (Central Valley)About 2.67 gal/sq ft in July Oleandervery low water (Central Valley)About 0.27 gal/sq ft in July Agavevery low water (Central Valley)About 0.27 gal/sq ft in July Bird of Paradisemoderate water (Central Valley)About 2.67 gal/sq ft in July Dahliasmoderate water (Central Valley)About 2.67 gal/sq ft in July Fig Treeslow water (Central Valley)About 1.07 gal/sq ft in July

Plant not on this list

The state database rates 4,103 plants, and every one of them lands in one of six water use classes for each climate zone. Find the class for your plant in WUCOLS, then read any guide here that shares it: the monthly table is the same arithmetic once the class is known.

The method is spelled out in what ETo is and where the numbers come from.