Potato
Also known as
Irish potato, White potato, Spud
Keep this plantās care guide close at hand.
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Solanum tuberosum, commonly known as the potato, is an herbaceous perennial in the nightshade family cultivated worldwide as a cool-season annual crop for its starchy underground tubers. Plants form pinnate leaves on branching stems and bear white to lavender flowers; small green berries may follow but are not edible. The edible portion is a swollen stolon (tuber), which should be kept covered to prevent greening and solanine accumulation. Potatoes prefer loose, well-drained, slightly acidic soils and benefit from hilling to increase yield and prevent exposure of tubers to light. Originating in the Andes of South America, they thrive in cool days and mild nights, struggling in sustained heat or frost. Susceptibility to pests and diseasesāparticularly late blight and Colorado potato beetleāmakes crop rotation, sanitation, and resistant varieties important. While the cooked tubers are a global staple, the foliage, sprouts, and green tubers are toxic if ingested. Container and garden cultivation are both effective with proper soil depth and consistent moisture.
Taxonomy
Properties & Requirements
How to care for Potato
Water
Keep soil consistently moist but never waterlogged. Provide roughly 1ā1.5 inches (25ā38 mm) of water per week, adjusting for rainfall and soil type. Water deeply to moisten the root and stolon zone, especially during tuber initiation and bulking (from flowering onward). Use mulch to stabilize moisture and reduce disease splash. Avoid overhead irrigation late in the day to limit foliar disease; drip or soaker hoses are ideal. Reduce watering as foliage begins to yellow, and stop 7ā10 days before maincrop harvest.
Light
Grow in full sun for 6ā8+ hours daily to maximize photosynthesis and yield. Strong light promotes sturdy vines, but tubers must be shielded from light to prevent greening and solanine formationāhill soil or add mulch as stems elongate. In very hot regions, brief afternoon shade can reduce heat stress without compromising production. For containers, position in uninterrupted sun and rotate periodically for even growth. Keep tubers fully covered at all times to avoid bitter, toxic greening.
Nutrients
Potatoes favor modest nitrogen with higher potassium and adequate phosphorus. Incorporate compost and a balanced, low- to moderate-N fertilizer (e.g., 5-10-10 or 8-24-24 based on soil test) before planting. Side-dress lightly when shoots are 15ā20 cm tall and again at first hilling, focusing on potassium. Maintain soil pH 5.2ā6.0 (slightly acidic) to minimize common scab; avoid fresh manure. Supply calcium (gypsum) if soil tests indicate deficiency to reduce internal defects. Always base rates on a soil analysis.
Temperature
Plant after danger of frost when soil is at least 45ā50Ā°F (7ā10Ā°C). Optimal daytime growth occurs around 60ā70Ā°F (15ā21Ā°C) with cool nights (50ā59Ā°F / 10ā15Ā°C). Tuber initiation and bulking are best in cool soils (approximately 59ā64Ā°F / 15ā18Ā°C). Frost damages foliage, while sustained heat above ~85Ā°F (29Ā°C) slows or halts tuberization and increases disease stress. Provide season extension (fleece, mulch) for late frosts and consider light afternoon shade or extra irrigation during heat waves.
