Growing Spinach, the Cold-Loving SUPER Green

Quick Overview

Successful spinach cultivation requires understanding its nature as a cold-loving crop that bolts easily due to heat or long daylight hours, necessitating succession planting, proper soil pH management, and harvesting outer leaves continuously to maximize yield.

Key Points: Spinach originated in Persia and historical associations with high iron content, popularized by Popeye, are largely inaccurate despite spinach retaining significant nutrition like Vitamins K, C, and A. Recommended varieties include Matador for fall growing, Bloomsdale (heirloom good for baby greens in 28 days and containers), Oceanside for downy mildew resistance, and Leavea for heat tolerance in warmer climates. Ideal germination soil temperature is around 500F; spinach struggles and bolts when temperatures reach the 700-800F range. Spinach requires a soil pH higher than six, as anything lower leads to yellow leaves. When transplanting, move spinach when it has two to four, maximum six, leaves to avoid stunting the taproot, which causes early bolting. Harvest spinach using a 'cut and come again' method by picking outer leaves, ensuring the central heart remains intact, and continuously fertilize with nitrogen-rich fertilizer to encourage growth. Bolting is triggered primarily when sunlight hours reach 13 to 14 hours (summer conditions) or when temperatures exceed 750F, making planting during shoulder seasons (spring/fall) critical.

Context: The video serves as a comprehensive gardening tutorial explaining how to successfully grow spinach, a plant often mistakenly treated like lettuce but known to be temperamental and prone to bolting (flowering) if environmental conditions or care are incorrect. The speaker reviews the plant's history, noting its Persian origin, and debunks the myth of extremely high iron content associated with its consumption via Popeye.

Detailed Analysis

To grow delicious spinach, gardeners must treat it as a cool-season crop, avoiding summer planting because heat and day length trigger bolting. Optimal soil temperature for germination is around 500F, and the soil pH must not drop below six. For starting seeds, use 16-cell trays because the leaves reduce significantly upon cooking, but transplant seedlings early (2-6 leaves) to protect the sensitive taproot. If direct seeding, space seeds about 6 inches apart, as overcrowding also causes bolting. Harvesting must be done continuously by picking the outer leaves, allowing the center heart to continue producing, and this continuous harvest should be supported by regular nitrogen fertilization. Crucially, spinach is a day-length obligate plant; once sunlight hits 13 to 14 hours, it will flower regardless of temperature, meaning the best planting windows are spring and fall/winter shoulder seasons. For guaranteed winter success, Space spinach offers high bolt resistance, and New Zealand spinach is mentioned as a perennial, heat-tolerant alternative that cooks similarly.