Spinach is a nutritional powerhouse that thrives in cool weather. Sown early or late, it delivers tender leaves when little else is growing.

When and how to plant

Spinach is very cold-hardy and grows best in cool soil, so sow it early, well before the last frost per the dates above, and again for fall. It bolts quickly once the days turn hot.

Care

Keep the soil moist and rich, and give it sun in spring and fall. In summer heat it runs to seed, so time plantings for the cool ends of the season.

Common problems

Leaf miners and downy mildew are the common problems. A row cover keeps miners off, and spacing improves airflow.

Harvest

Cut outer leaves as they reach a usable size, or take the whole plant. Harvest before hot weather triggers bolting.

Popular Spinach varieties to grow

Choose spinach by bolt resistance, cold tolerance, and leaf type, since smooth and savoyed leaves behave differently in the kitchen and garden. In many US gardens, the best varieties are the ones that resist bolting longest in spring and germinate well for fall crops.

Variety notes are general guidance for US home gardens; local performance varies by climate and season. Availability differs by seed supplier.

Growing Spinach in containers

Spinach grows well in containers during cool weather. Use a container at least 6 to 8 inches deep with drainage holes and fertile, moisture-retentive potting mix. Keep the mix consistently moist, feed lightly if plants will remain for several weeks, and choose slow-bolting varieties for spring plantings.

Watering & feeding Spinach

Supply about 1 inch of water per week, increasing slightly during dry, windy periods. Spinach is moderately thirsty and does best when its shallow roots do not dry out. Water at the soil level with enough frequency to keep the upper root zone evenly moist, preferably in the morning. Use mulch where practical, watch containers closely, and treat wilting as a sign of dryness while yellow foliage and persistently wet soil may signal overwatering.

Spinach is a moderate feeder that benefits from compost and fertile soil prepared before sowing. Nitrogen supports leaf production, but adequate overall soil fertility and good drainage are also important. Work compost into the bed before planting and apply a light nitrogen-containing feeding only if soil is low in fertility. For a longer harvest period, side-dress lightly after the first major picking, avoiding heavy nitrogen applications. Keep spinach shaded from intense late-season heat when possible. Water promptly after harvest to help new leaves regrow.

Saving Spinach seeds

Save seed from open-pollinated spinach only, since F1 hybrids do not come true, and keep varieties isolated because spinach is wind-pollinated. Spinach plants are male or female, so leave enough plants of both sexes until female plants have dry, brown seed clusters. Strip off the dry clusters, thresh and clean them, dry them fully indoors, and store cool and dry for roughly 3 to 5 years.

Spinach companion plants

Good companions for spinach include radishes, lettuce, peas on a trellis, and flowering cilantro or dill nearby. Radishes make efficient use of space during spinach's cool-season growth, and flowering herbs can support beneficial insects that prey on aphids. Avoid placing spinach tightly beside mature fennel or large warm-season crops, because their shade and root competition conflict with spinach's shallow-rooted, cool-season habit.

Frequently asked questions about Spinach

General guidance for US home gardens. Reference figures are typical values; your exact timing depends on your local frost dates and variety. Page updated Aug 4, 2026.