Growing Spinach in Zone 10b

Your planting timeline

1. Direct sowonce soil warms, around January 20
2. Harvestabout 37–50 days from transplant

Best varieties for zone 10b

Plant strictly in the coolest weeks of winter, choosing fast, heat-tolerant, bolt-resistant types like Seaside and Malabar 'spinach' as a warm-season substitute the rest of the year.

Growing notes

Spinach needs steady, even moisture — about 1 to 1.5 inches of water per week — to keep its shallow roots cool and the leaves tender and mild. Let the bed dry out and stressed plants bolt early and turn bitter, so water consistently rather than in feast-or-famine swings. Aim to keep the top inch or two of soil reliably damp but never waterlogged, since soggy ground invites damping-off and downy mildew. Water at the base in the morning so the foliage dries quickly, which discourages leaf disease in cool, humid weather. A light mulch of straw or shredded leaves steadies soil moisture and keeps spring rain from splashing grit onto the low-growing leaves.