Growli
Let's go

Plant care

Potato (spud) care

Solanum tuberosum

Also called white potato, Irish potato, spud.

Light

Potato is a sun-lover and needs the brightest spot in the home to thrive. 6+ hours of direct sun. Indoors that almost always means a south or west-facing windowsill in the northern hemisphere. Plants moved abruptly from low light to direct sun will scorch — acclimate them over 7-10 days by giving a little more sun each day.

Watering

Outdoor potato crops want steady moisture, especially during flowering. The single best habit is a finger-test before watering — push a finger 3-4 cm into the soil. If it comes back damp, wait a day. If it comes back dust-dry, water deeply at the base of the plant. Critical during tuber formation — uneven watering causes hollow heart and scab.

Soil and pot

Potato grows best in rich, well-drained loam. Compost-rich; pH 5.0-6.5. Slightly acidic soil deters scab. A pot with a working drainage hole is non-negotiable for this species — even free-draining mix will turn soggy in a closed planter. If you love the look of a decorative pot without a hole, use it as a cachepot around an inner nursery pot you can lift out to water.

Humidity and temperature

Potato sits happiest at around 40-70% (outdoor) humidity and 13-21°C (55-70°F). Outdoor humidity rarely matters. If you keep the room above 13 year-round and avoid placing the plant near a cold draught, a hot radiator, or an air-conditioning vent, you have already handled the two biggest indoor stressors.

Fertilising

Feed potato sparingly. A balanced feed at planting; nitrogen feed at earthing-up. Avoid excessive nitrogen — it produces leaf at the expense of tubers. Skip fertiliser entirely on a stressed, recently-repotted, or actively wilting plant — fertiliser salts make damage worse, not better. Wait for a round of healthy new growth before resuming a feeding rhythm.

Common problems

Below are the issues we see most often on potato in the Growli community. Each is annotated with the most common cause so you know where to start.

Companion plants

Potato pairs well with Bean, Corn, Marigold, and Horseradish. These are species with similar light and water needs, so you can grow them in the same bed or container without conflict.

Propagation

Plant chitted seed potatoes in spring once soil is workable; 30 cm spacing for earlies, 38 cm for maincrops. Propagation is the cheapest, most satisfying way to expand a collection — and it doubles as insurance against losing a mature plant to an accident. Take a backup cutting once the parent is established and healthy.

Toxicity to pets

Potato is toxic to pets. ASPCA lists Solanum tuberosum as toxic to cats, dogs, and horses due to solanine in foliage, stems, and green-skinned tubers. Cooked white-flesh tubers without green skin are safe. If you keep cats, dogs, or curious children in the house, weigh placement carefully — a high shelf or a hanging planter is enough for casual safety. For severe ingestion incidents, call your local vet and the ASPCA Animal Poison Control Center (in the US, 888-426-4435).

Pet-safety status is sourced from the ASPCA Toxic and Non-Toxic Plant List, which catalogues the most-asked-about plants for cats, dogs, and horses.

Potato care — frequently asked questions

What is the common name for Solanum tuberosum?

Solanum tuberosum is most commonly called Potato, but it is also known as white potato, Irish potato, spud. The names refer to the same species, so care instructions for Potato apply identically to anything sold as spud.

How much light does potato need?

Potato grows best in direct sun (at least 4-6 hours). 6+ hours of direct sun.

How often should I water potato?

Water potato steady moisture, especially during flowering. Critical during tuber formation — uneven watering causes hollow heart and scab. The finger-test (or lifting the pot to feel its weight) beats a fixed weekly calendar because pot size, light, and season all change how fast the soil dries.

Is potato toxic to cats and dogs?

Potato is toxic to pets. ASPCA lists Solanum tuberosum as toxic to cats, dogs, and horses due to solanine in foliage, stems, and green-skinned tubers. Cooked white-flesh tubers without green skin are safe.

What USDA hardiness zone does potato grow in?

Potato is rated for USDA zone Grown as an annual in zones 3-10 and RHS hardiness H2 (tender top growth; tubers stored at 5-10°C). Outside that range, grow it as a container plant that overwinters indoors before the first hard frost.

Potato deep-dive guides

Every aspect of potato care, each with its own calibrated guide:

Related guides

Potato is also known as white potato, Irish potato, and spud.