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Plant care

Red Prince Weigela (Old-fashioned Weigela) care

Weigela florida 'Red Prince'

Also called Red Prince Weigela, Old-fashioned Weigela.

RHS H6USDA 4-8Mildly toxic to petsIndoor 1.5-2 m tall

Watering rhythm

7-10days

When the top 3-5 cm of soil is dry, roughly every 7-10 days in the growing season

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Light

Direct sun (at least 4-6 hours)

Soil

Fertile, well-drained loam or clay-loam

Humidity

40-65%

Temp

-20 to 30°C

Pet safety

Mildly toxic to pets

Mature size

1.5-2 m tall

Care at a glance

Light

Most houseplants will scorch where red prince weigela thrives. Give it the windowsill you'd otherwise leave empty because everything else burned there. Flowers most prolifically in full sun (6+ hours per day). Tolerates partial shade but flowering is noticeably reduced. A south- or west-facing border position is ideal. A plant moved abruptly from low light to direct sun bleaches in 48 hours — always acclimatise over a week.

Watering

Aim for when the top 3-5 cm of soil is dry, roughly every 7-10 days in the growing season for red prince weigela, but treat that as a starting point rather than a rule. A south-facing summer windowsill will dry the pot twice as fast as a north-facing winter room. Lift the pot; if it feels noticeably lighter than it did wet, water it. Once established, Weigela is moderately drought-tolerant. Water young plants regularly during the first two growing seasons. Avoid waterlogging, which causes root rot. Mulch in summer to retain moisture.

Soil and pot

Red Prince Weigela grows best in fertile, well-drained loam or clay-loam. Adapts to a wide range of soils including clay, loam, and sandy soils, as long as drainage is adequate. Slightly acidic to neutral pH (6.0–7.0) is optimal. Enrich poor soil with organic compost at planting. 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

Red Prince Weigela sits happiest at around 40-65% humidity and -20 to 30°C (-4 to 86°F). Tolerates typical outdoor humidity without issues. Not sensitive to humidity fluctuations. No special humidity management required for outdoor cultivation. If you keep the room above 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 red prince weigela sparingly. Apply a general-purpose slow-release granular fertiliser in early spring as buds break. A further top-dressing of potassium-rich feed after the first flush of flowers encourages repeat blooming without forcing lush leafy growth. 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 red prince weigela in the Growli community. Each is annotated with the most common cause so you know where to start.

  • Few flowers — Usually caused by pruning at the wrong time; prune immediately after flowering as blooms form on old wood — never in autumn or early spring.
  • Leggy growth — Older unpruned specimens become bare at the base; rejuvenate every 3-4 years by cutting up to one-third of the oldest stems to the ground.
  • Aphids — Clusters of greenfly on new shoots in spring; knock off with a jet of water or apply insecticidal soap. Natural predators usually control them.
  • Scale insects — Brown bumps on stems cause sticky honeydew and sooty mould; treat with a winter oil spray when dormant.
  • Canker — Sunken discoloured patches on stems from fungal infection; prune affected wood back to healthy tissue and dispose of cuttings away from the compost heap.

Companion plants

Red Prince Weigela pairs well with Salvia nemorosa, Allium hollandicum, Geranium, and Nepeta. These are species with similar light and water needs, so you can group them in the same room or on the same shelf and water as a batch.

Propagation

Take hardwood cuttings 20-25 cm long in late autumn or early winter and insert in a free-draining rooting medium in a cold frame. Softwood cuttings taken in early summer also root readily under mist or a humidity tent. 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

Red Prince Weigela is mildly toxic to pets. Weigela florida is not individually listed by the ASPCA as toxic. The genus carries no known high-toxicity compounds, but as it is not confirmed ASPCA non-toxic, a conservative mildly-toxic rating is applied. Keep pets from ingesting plant material as a precaution. 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.

Red Prince Weigela care — frequently asked questions

What is the common name for Weigela florida 'Red Prince'?

Weigela florida 'Red Prince' is most commonly called Red Prince Weigela, but it is also known as Red Prince Weigela, Old-fashioned Weigela. The names refer to the same species, so care instructions for Red Prince Weigela apply identically to anything sold as Old-fashioned Weigela.

How much light does red prince weigela need?

Red Prince Weigela grows best in direct sun (at least 4-6 hours). Flowers most prolifically in full sun (6+ hours per day). Tolerates partial shade but flowering is noticeably reduced. A south- or west-facing border position is ideal.

How often should I water red prince weigela?

Water red prince weigela when the top 3-5 cm of soil is dry, roughly every 7-10 days in the growing season. Once established, Weigela is moderately drought-tolerant. Water young plants regularly during the first two growing seasons. Avoid waterlogging, which causes root rot. Mulch in summer to retain moisture. 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 red prince weigela toxic to cats and dogs?

Red Prince Weigela is mildly toxic to pets. Weigela florida is not individually listed by the ASPCA as toxic. The genus carries no known high-toxicity compounds, but as it is not confirmed ASPCA non-toxic, a conservative mildly-toxic rating is applied. Keep pets from ingesting plant material as a precaution.

What USDA hardiness zone does red prince weigela grow in?

Red Prince Weigela is rated for USDA zone 4-8 and RHS hardiness H6. Outside that range, grow it as a container plant that overwinters indoors before the first hard frost.

Red Prince Weigela deep-dive guides

Every aspect of red prince weigela care, each with its own calibrated guide:

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Red Prince Weigela qualifies for 5 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

Related guides

Red Prince Weigela is also commonly called Red Prince Weigela or Old-fashioned Weigela.