Types of spinach and how to grow?

 

The main types of true spinach (Spinacia oleracea) are classified by leaf texture: Savoy, Smooth-leaf (or Flat-leaf), and Semi-savoy. These differ in appearance, ease of cleaning, cold or heat tolerance, and common uses, with many specific cultivars available.

Savoy (Crinkled or Curly-Leaf) Spinach

• Deeply crinkled, puckered, or curly dark green leaves with a thicker texture.
• Often more cold-tolerant and productive; the wrinkles can trap soil, making them harder to clean.
• Excellent flavor for cooking (sautéing, soups, braising) as the texture holds up well; also used in salads.

Popular examples: Bloomsdale (or Bloomsdale Long Standing; classic heirloom, productive, good cold hardiness but limited bolt resistance), Regiment (fast-growing, good for baby leaves).

Smooth-Leaf (Flat-Leaf) Spinach

• Broad, smooth, unwrinkled leaves that are easier to wash and process.
• Preferred for commercial production, freezing, canning, and processed foods; milder, tender flavor suited to raw use in salads or smoothies.
• Can grow lower to the ground (more prone to soil splash) and may bolt more readily in some varieties.

Popular examples: Space (hybrid, slower to bolt, good disease resistance), Corvair, Matador.

Semi-Savoy Spinach

A hybrid with moderately or lightly crinkled leaves—combining some of the texture of savoy with easier cleaning and more upright growth (less soil splash).

Often better bolt resistance, disease resistance (e.g., to downy mildew), and suitability for home gardens or commercial harvest.

Versatile for both fresh eating and cooking.

Popular examples: Tyee (bolt- and mildew-resistant, upright), Indian Summer, Catalina.

Other Notes on True Spinach Varieties

• Baby spinach: Not a separate type—simply young, tender leaves harvested early from any of the above (milder and popular in bags for salads).
• Red-veined or colored varieties: Such as Red Kitten or Red Cardinal, with red stems/veins for visual appeal in salads; flavor is similar but often milder or sweeter.
• Cultivars are also selected for season: cool-season/spring-fall types, more bolt-resistant ones for warmer periods, or cold-hardy winter varieties (e.g., Giant Winter). Modern hybrids often emphasise disease resistance and yield.

Spinach generally prefers cool weather and can bolt (go to seed) in heat/long days; choose varieties accordingly for continuous harvests via succession planting.

Plants Commonly Called “Spinach” but Not True Spinach

These are unrelated or only distantly related greens used similarly:

• New Zealand spinach (Tetragonia tetragonioides): Heat-tolerant, triangular leaves; mild/slightly salty flavor; thrives in warmer conditions where true spinach bolts.
• Malabar spinach (Basella alba or rubra): Vining tropical plant with thick, mucilaginous leaves; good cooked or in salads in hot climates.
• Perpetual spinach (a type of leaf beet/chard, Beta vulgaris): Long-cropping, mild, bolt-resistant; often grown as a spinach alternative.

Others include mountain spinach, certain amaranths (especially in Asian cuisines, sometimes called bayam), and regional greens.

True spinach is rich in nutrients (vitamins A, C, K, folate, iron, etc.) across types, with minor differences mainly in texture and growing habits rather than major nutritional variation. Choose based on your climate, intended use (raw vs. cooked), and preference for cleaning ease. Many seed catalogs list bolt-resistant or disease-resistant options for reliable home growing.

How to grow spinach?

Spinach (Spinacia oleracea) is a fast-growing, cool-season leafy green that thrives in mild temperatures (ideally 45–70°F / 7–21°C) and can be harvested in as little as 25–50 days. It bolts (flowers and turns bitter) in heat above about 75°F (24°C) or long days, so it is best grown in spring and fall.

When and Where to Grow

• Timing: Sow in early spring as soon as soil is workable (typically 4–8 weeks before the last frost, when soil is at least 40°F / 4°C). For a fall crop, sow 6–8 weeks before the first frost. Succession-sow every 1–2 weeks for continuous harvest. In mild climates, hardy varieties can overwinter with protection.
• Location: Full sun (at least 4–6 hours) to partial shade. Afternoon shade helps prevent bolting in warmer weather. Choose a site with good air circulation.
• Soil: Fertile, well-drained soil rich in organic matter (amend with compost or aged manure). Prefer pH 6.0–7.0 (slightly acidic to neutral). Loosen soil 12 inches deep because spinach develops a long taproot. Avoid waterlogged conditions.

How to Plant?

• Direct sowing is preferred—seedlings do not transplant easily.
• Prepare the bed by mixing in compost.
• Sow seeds ½ inch (about 1 cm) deep and 1–2 inches apart in rows 12–18 inches apart (or broadcast in a wide bed/block).
• Keep soil moist. Seeds typically germinate in 7–14 days at soil temperatures of 45–65°F (7–18°C). Fresh seed is important, as viability declines quickly.
• Thin seedlings to 3–6 inches apart once they reach about 2 inches tall (eat the thinnings as microgreens or baby leaves).

Containers: Use pots or raised beds at least 8–12 inches deep with quality potting mix. Water more frequently, as containers dry out faster.

Varieties: Choose bolt-resistant types such as Bloomsdale Long Standing (savoy), Olympia, Space, or Tyee. There are smooth-leaf, savoy (crinkled), and semi-savoy options. For hot summers, consider heat-tolerant alternatives like New Zealand spinach or Malabar spinach (not true spinach but similar in use).

Care and Maintenance

• Watering: Keep soil consistently moist (about 1–2 inches of water per week). Dry conditions stress plants and encourage bolting. Mulch to retain moisture and keep roots cool. Water in the morning.
• Fertilizer: Spinach is a heavy feeder, especially of nitrogen. Side-dress with compost, fish emulsion, or a high-nitrogen fertilizer once plants are established or about one-third grown.
• Weeding and protection: Weed carefully by hand (roots are shallow). Use row covers to deter pests (slugs, snails, aphids, leaf miners) and help regulate temperature. In heat, provide shade cloth.
• Temperature tolerance: Young plants can survive light frosts and temperatures down to about 15–20°F (-9 to -7°C); mature plants are hardier. Cover if hard freezes are expected.
• Harvesting Begin harvesting baby leaves when they are 2–4 inches long (often 25–35 days). For mature leaves, wait until they are 4–6+ inches. Use a cut-and-come-again method: snip outer leaves at the base, leaving the center to continue growing. Or cut the entire plant just above soil level. Harvest before plants bolt for best flavor—leaves become bitter after flowering. Regular harvesting encourages more production.

**Store unwashed leaves in the refrigerator; wash just before use.

Common Issues and Tips

• Bolting: Caused by heat, long days, or stress (drought, overcrowding). Plant at the right time, keep soil moist, choose bolt-resistant varieties, and provide shade.
• Pests/diseases: Watch for downy mildew in humid conditions; ensure good air flow and avoid overhead watering late in the day. Row covers help with insects.

Extra tips: Spinach grows quickly and pairs well in succession plantings or interplanted with taller crops that provide later shade. It can be grown year-round in mild climates or under protection (cold frames, cloches, or greenhouses) with the right varieties.

Success depends heavily on cool conditions and consistent moisture. Check local frost dates and soil temperatures for your area, and start with a small succession planting. Fresh garden spinach is far more tender and flavorful than store-bought.