Single heart-shaped green hoya leaves planted upright in small orange pots

Hoya kerrii

Hoya kerrii
Care level: Easy

Hoya kerrii, the sweetheart hoya, is a slow-growing evergreen vine from South-East Asia with stiff, fleshy, heart-shaped leaves about 6cm wide on woody, twining stems. It is best known as a single rooted leaf sold in a small pot, but a full plant is a climber that in summer carries domed clusters of fragrant white flowers with purple centres. Its thick leaves store water, so it forgives a missed watering far more readily than an overwatered pot.

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Information

Varieties and related species
Hoya kerrii 'Variegata'Hoya kerrii 'Reverse Variegata'Hoya kerrii 'Splash'

Light

Bright, indirect light, shaded from hot sun.

Water

Water moderately in growth and let the compost dry between waterings. Keep it just moist in winter.

Humidity

Average room humidity is fine; it enjoys a little more.

Soil

A fast-draining, peat-free, loam-based compost with extra organic matter.

Temperature

Warm room temperature, about 18-27°C. Keep it above 10°C.

Size

0.5-1m tall.

Growth speed

Slow

Pet safety not confirmed

As a precaution, keep it out of reach of children and pets.

Did you know?

The single heart-shaped leaf sold for Valentine's Day usually stays a single leaf. A leaf can root and live for years, but it only grows into a vine if a piece of stem with a growth point was taken with it. For a plant that climbs and flowers, buy one that already has a stem and several leaves.

Care by Season

Spring

Growth resumes. Start feeding monthly and layer stems if you want new plants.

Summer

Water moderately and shade from hot sun. Mature plants flower now.

Autumn

Reduce watering as growth slows and stop feeding.

Winter

Keep it just moist in a bright, warm spot away from cold glass.

Growing & Maintenance

Soil and pot

Use a fast-draining, peat-free, loam-based compost with added organic matter, in a pot with drainage holes.

Repotting

Leave it in the same pot for years. Repot only when the roots fill the pot completely, moving up one size.

Fertilising

Feed monthly with a balanced liquid fertiliser while it is growing.

Support

Give vining plants a hoop, trellis or moss pole and tie in the stems as they lengthen.

Propagation

By layering in spring or summer, or by stem cuttings with a node, rooted in warmth in late summer.

Pests & Diseases

Common problems

A single leaf that never grows

Most likely cause: It was cut without a stem node.
What to do: Enjoy it as it is, or buy a plant with a stem.

Yellow, soft leaves

Most likely cause: Overwatering.
What to do: Let the compost dry and water less often.

Wrinkled, thin leaves

Most likely cause: The plant has been dry for too long.
What to do: Water thoroughly; the leaves plump up again over a few days.

No flowers on a mature plant

Most likely cause: Too little light, a recent repotting, or flower stalks that were cut off.
What to do: Give it bright light, leave it pot-bound and keep the old flower stalks.

Brown, scorched patches

Most likely cause: Hot direct sun through glass.
What to do: Move it out of the midday sun.

Long bare stems with no leaves

Most likely cause: New shoots lengthen first and leaf up later.
What to do: Do not cut them; tie them to a support and wait.

Pests & Diseases

Mealybugs

Signs: White, cottony tufts where the leaves join the stem and on the undersides of the leaves.
Treatment: Wipe them off with a cotton bud dipped in rubbing alcohol and repeat weekly until they are gone. Check the undersides of the leaves and the crevices where the leaf stem meets the main stalk.

Root rot

Signs: Leaves turn yellow and soft and the stem blackens at the base, in compost that stays wet.
Treatment: Take healthy stem cuttings to start again, and water much less in a free-draining mix.

Aphids

Signs: Clusters of small insects on young shoots and flower buds, with sticky honeydew.
Treatment: Rinse them off with water and repeat after a few days.

FAQ

Why is my single-leaf Hoya kerrii not growing?

Most single leaves were cut without a piece of stem, and without a stem node there is nothing for new growth to come from. The leaf stays healthy and rooted but does not change. If yours does have a node, growth can still take a year or more to start.

How often should I water it?

Water moderately while it is growing, letting the compost dry out a good way between waterings, and keep it just moist in winter. The fleshy leaves store water; soft, yellowing leaves mean too much, wrinkled leaves mean too little.

How much light does it need?

Bright, indirect light, with shade from hot midday sun. In poor light it stops growing and will not flower.

How do I get it to flower?

Give a mature, vining plant bright light and leave it in the same pot; hoyas flower best when the roots are a little crowded. Never cut off the short flower stalks after flowering, because new flowers form on the same stalks year after year.

Should I repot it?

Rarely. Hoyas resent root disturbance and can stay in the same pot for many years. Move it up one size only when the roots have completely filled the pot.

How do I propagate it?

By layering a stem in spring or summer, or from stem cuttings that include at least one node, kept warm until they root. A leaf alone roots but seldom makes a plant.

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