Clematis 'Mrs N. Thompson' (Mrs N. Thompson Clematis) care

Light

Clematis 'Mrs N. Thompson' needs sun on the leaves, not just bright ambient room light. Performs best in full sun or very light partial shade. At least 5-6 hours of direct sun per day supports strong flowering. Keeping the root zone cool is more important than shading the canopy. 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

Water clematis 'mrs n. thompson' once or twice a week during the growing season; reduce in cooler months. The actual day count varies with pot size, light, and season — the finger test (or lifting the pot to feel its weight) is more reliable than a fixed calendar. Empty any drainage saucer afterwards so the pot isn't sitting in water. Water deeply at the base, keeping foliage dry to limit fungal issues. Consistent moisture is critical during bud development; irregular watering can cause bud drop.

Soil and pot

Clematis 'Mrs N. Thompson' grows best in well-drained, fertile loam enriched with compost. Neutral to slightly alkaline pH (6.5-7.5) is ideal. In containers, use a John Innes No. 3 or premium loam-based mix to provide stability and moisture retention. 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

Clematis 'Mrs N. Thompson' sits happiest at around 40-70% humidity and 5-25°C (41-77°F). Average outdoor humidity is fine. Ensure good air circulation to prevent powdery mildew, particularly in warm and sheltered spots. If you keep the room above 5 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 clematis 'mrs n. thompson' sparingly. Feed with a balanced slow-release fertiliser in spring, then switch to a high-potash liquid feed every two weeks through the growing season to promote prolific repeat blooms. 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 clematis 'mrs n. thompson' in the Growli community. Each is annotated with the most common cause so you know where to start.

• Clematis wilt — Rapid wilting caused by Calophoma clematidina. Cut back to ground level; the plant typically regenerates from the roots the following season.
• Powdery mildew — Common in dry, warm weather. Water consistently at the root zone and ensure good airflow. Treat with a mildew-specific fungicide if needed.
• Vine weevil — Larvae feed on roots, causing sudden collapse in container-grown plants. Use biological nematode treatments in late summer.
• Scale insects — Brown or white crusts on stems reduce vigour. Treat with a horticultural oil or systemic insecticide in late winter.
• Over-pruning — As a Group 2 clematis, only remove dead or weak stems in late winter — hard pruning eliminates the first flowering flush on old wood.

Companion plants

Clematis 'Mrs N. Thompson' pairs well with Rosa 'New Dawn', Geranium 'Rozanne', Lavandula angustifolia, and Stachys byzantina. 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

Propagate by internodal cuttings taken in late spring, with one pair of leaves retained, in a humid propagating environment. Layering a low stem in autumn is also effective. 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

Clematis 'Mrs N. Thompson' is toxic to pets. The ASPCA lists Clematis as toxic to dogs, cats, and horses. All plant parts contain protoanemonin, causing irritation, salivation, and gastrointestinal upset; sap contact may irritate skin. 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.

Clematis 'Mrs N. Thompson' deep-dive guides

Every aspect of clematis 'mrs n. thompson' care, each with its own calibrated guide:

• Common clematis 'mrs n. thompson' problems & fixes
• Clematis 'Mrs N. Thompson' watering schedule
• Clematis 'Mrs N. Thompson' light requirements
• Best soil mix for clematis 'mrs n. thompson'
• Clematis 'Mrs N. Thompson' fertilizing guide
• When to repot clematis 'mrs n. thompson'
• How to propagate clematis 'mrs n. thompson'
• How to prune clematis 'mrs n. thompson'
• What's eating my clematis 'mrs n. thompson'?
• Clematis 'Mrs N. Thompson' growth rate & size
• Clematis 'Mrs N. Thompson' cold hardiness
• Clematis 'Mrs N. Thompson' temperature & humidity
• Is clematis 'mrs n. thompson' toxic to cats & dogs?
• Is clematis 'mrs n. thompson' toxic to cats?
• Is clematis 'mrs n. thompson' toxic to dogs?
• All 44 Clematis varieties
• Getting clematis 'mrs n. thompson' to bloom

Featured in these plant shortlists

Clematis 'Mrs N. Thompson' qualifies for 5 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

• Best trailing & climbing houseplants — Vining and trailing houseplants for shelves, hanging pots, and moss poles — selected by growth habit.
• Best flowering houseplants — Indoor plants grown for their blooms — selected from the flowering species in Growli’s plant-care library.
• Houseplants toxic to cats & dogs — The common houseplants the ASPCA lists as toxic to cats and dogs — the ones to keep out of reach, each with its symptoms and a safe alternative.
• Best houseplants for full sun — Houseplants that want direct sun — the species for a hot south or west-facing windowsill where shade-lovers scorch.
• Best houseplants for a cool room — Houseplants that tolerate cool conditions down to about 10°C — for an unheated spare room, hallway, porch or a home kept cool.
• Browse all 30 plant shortlists — pet-safe, low-light, drought-tolerant and more

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