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Plant care

Beauregard Sweet Potato (Sweet potato) care

Ipomoea batatas

Also called Sweet potato, Kumara, Yam (US informal).

RHS H1c (tender; no frost tolerance)USDA 9-11Pet-safeIndoor Vines spread 2-3 m

Watering rhythm

5-7days

Water deeply every 5-7 days; reduce to every 10-14 days as vines mature and in the final weeks before harvest

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Light

Direct sun (at least 4-6 hours)

Soil

Light, free-draining, sandy loam

Humidity

50-70%

Temp

21-30°C

Pet safety

Pet-safe

Mature size

Vines spread 2-3 m

Care at a glance

Light

Beauregard Sweet Potato needs sun on the leaves, not just bright ambient room light. Requires maximum sun — 8+ hours daily. In the UK, a polytunnel or south-facing raised bed gives the heat and light needed for good tuber development. A south or west-facing windowsill in the northern hemisphere is the default; anywhere else, expect the plant to stretch and pale out within a season.

Watering

Outdoor beauregard sweet potato crops want water deeply every 5-7 days; reduce to every 10-14 days as vines mature and in the final weeks before harvest. The single best habit is a finger-test before watering — push a finger 3-4 cm into the soil. Damp = wait a day; dust-dry = water deeply at the base of the plant. Consistent moisture during the first 8 weeks after planting is critical for vine establishment and tuber initiation. Overwatering encourages foliage at the expense of tubers; reduce watering as harvest approaches.

Soil and pot

Beauregard Sweet Potato grows best in light, free-draining, sandy loam. Heavy or waterlogged soils produce misshapen tubers and root rot. Avoid freshly manured ground (causes forked, hairy tubers). pH 5.5–6.5. Raised beds with gritty, well-drained mix are ideal. 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

Beauregard Sweet Potato sits happiest at around 50-70% humidity and 21-30°C (70-86°F). Tolerates a wide humidity range. Good ventilation in polytunnel growing is important to reduce fungal problems. Trailing vines benefit from room to spread freely. If you keep the room above 21 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 beauregard sweet potato sparingly. Apply a low-nitrogen, high-potassium fertiliser at planting (excess nitrogen promotes leafy growth over tubers). A balanced tomato feed every 3-4 weeks during the growing season supports healthy tuber development. Stop feeding 4 weeks before harvest. 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 beauregard sweet potato in the Growli community. Each is annotated with the most common cause so you know where to start.

  • Vine weevil — Larvae attack tubers underground. Use nematode biological control (Steinernema kraussei) in late summer/early autumn.
  • Slug damage on tubers — Surface scarring and tunnelling. Harvest promptly once mature; use ferric phosphate pellets if damage is severe.
  • Poor tuber set — Caused by excessive nitrogen, cold soil, or drought stress early in the season. Ensure warm soil (18°C+) at planting and use a low-nitrogen feed.
  • Powdery mildew — White powder on leaves in dry conditions. Ensure adequate air circulation, especially in polytunnels. Water at the base rather than overhead.
  • Mice and voles — Root-zone tubers are attractive to rodents. Protect with wire mesh below the bed if rodent pressure is high.

Companion plants

Beauregard Sweet Potato pairs well with Sweetcorn, Courgette, Thyme, and Nasturtium. These are species with similar light and water needs, so you can grow them in the same bed or container without conflict.

Propagation

Grow from slips (rooted shoots) taken from a tuber in spring: place a tuber half-submerged in water in a warm place (21°C+) and root the emerging shoots. Plant slips out after last frost when soil has warmed. Can also be grown from purchased certified slips. 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

Beauregard Sweet Potato is pet-safe. The ASPCA lists Ipomoea batatas (sweet potato vine) as non-toxic to dogs, cats, and horses. Ornamental sweet potato vine leaves and standard edible tubers pose no toxicity risk to pets. 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.

Beauregard Sweet Potato care — frequently asked questions

What is the common name for Ipomoea batatas?

Ipomoea batatas is most commonly called Beauregard Sweet Potato, but it is also known as Sweet potato, Kumara, Yam (US informal). The names refer to the same species, so care instructions for Beauregard Sweet Potato apply identically to anything sold as Sweet potato.

How much light does beauregard sweet potato need?

Beauregard Sweet Potato grows best in direct sun (at least 4-6 hours). Requires maximum sun — 8+ hours daily. In the UK, a polytunnel or south-facing raised bed gives the heat and light needed for good tuber development.

How often should I water beauregard sweet potato?

Water beauregard sweet potato water deeply every 5-7 days; reduce to every 10-14 days as vines mature and in the final weeks before harvest. Consistent moisture during the first 8 weeks after planting is critical for vine establishment and tuber initiation. Overwatering encourages foliage at the expense of tubers; reduce watering as harvest approaches. 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 beauregard sweet potato toxic to cats and dogs?

Beauregard Sweet Potato is pet-safe. The ASPCA lists Ipomoea batatas (sweet potato vine) as non-toxic to dogs, cats, and horses. Ornamental sweet potato vine leaves and standard edible tubers pose no toxicity risk to pets.

What USDA hardiness zone does beauregard sweet potato grow in?

Beauregard Sweet Potato is rated for USDA zone 9-11 (grown as warm-season annual elsewhere) and RHS hardiness H1c (tender; no frost tolerance). Outside that range, grow it as a container plant that overwinters indoors before the first hard frost.

Beauregard Sweet Potato deep-dive guides

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

Featured in these plant shortlists

Beauregard Sweet Potato qualifies for 2 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

Related guides

Beauregard Sweet Potato is also known as Sweet potato, Kumara, and Yam (US informal).