Hoya kerrii, commonly known as the Sweetheart Plant or Valentine Hoya, is one of the most recognisable houseplants thanks to its thick, heart-shaped leaves. Native to Southeast Asia, this attractive trailing plant is loved for its unique foliage, easy-care nature, and ability to produce clusters of fragrant star-shaped flowers when mature.

While single-leaf specimens are often sold as novelty plants, a fully rooted Hoya kerrii will eventually develop long vines adorned with succulent leaves. Given time, warmth, and bright conditions, mature plants can reward growers with beautiful clusters of creamy-white flowers featuring deep pink centres and a sweet fragrance.

Its drought tolerance and low-maintenance requirements make Hoya kerrii an excellent choice for both beginners and experienced houseplant collectors.

Plant Information

• Botanical Name: Hoya kerrii

• Common Name: Sweetheart Plant, Valentine Hoya

• Family: Apocynaceae

• Origin: Thailand, Laos, Cambodia, Vietnam and Southern China

• Growth Habit: Climbing or trailing vine

• Difficulty: Easy

• Pet Safe: Generally considered non-toxic to cats and dogs.

Light Requirements

Hoya kerrii thrives in bright conditions and appreciates plenty of indirect light.

Ideal conditions:

• Bright indirect light

• East or west-facing windows

• A few hours of gentle morning sun

• Bright conservatories

Avoid:

• Deep shade

• Prolonged low-light conditions

• Harsh midday summer sun through glass

Brighter conditions encourage stronger growth, larger leaves, and increase the likelihood of flowering.

Watering

As a semi-succulent plant, Hoya kerrii stores water in its thick leaves and prefers to dry out slightly between waterings.

Water when:

• The top half of the compost has dried out

• The pot feels noticeably lighter

Reduce watering:

• During winter

• In cooler rooms

• During periods of slower growth

Avoid:

• Constantly wet compost

• Standing water around the roots

• Overwatering

Hoya kerrii is far more tolerant of underwatering than overwatering.

Humidity

Hoya kerrii adapts well to typical household humidity levels.

Ideal humidity:

• 40–70%

While additional humidity can encourage faster growth, it is not essential for healthy plants.

Temperature

Warm temperatures help promote steady growth.

Ideal range:

• 18°C – 30°C

Minimum temperature:

• 12°C

Avoid:

• Cold draughts

• Frost

• Sudden temperature fluctuations

Soil and Potting Mix

A free-draining potting mix is essential.

Recommended mix:

• Houseplant compost

• Orchid bark

• Perlite or pumice

• Small amount of horticultural charcoal

The roots appreciate plenty of airflow and should never remain waterlogged.

Feeding

Feed during the active growing season.

Recommended:

• Balanced liquid fertiliser

• Every 2–4 weeks during spring and summer

Reduce feeding during autumn and winter.

Growth and Size

Hoya kerrii is a relatively slow-growing species, particularly when young.

Mature characteristics:

• Thick heart-shaped leaves

• Climbing or trailing vines

• Woody stems with age

• Spectacular clusters of fragrant flowers

Typical indoor size:

• Vines can reach over 2 metres long when mature

• Leaves can grow 5–10 cm wide

Provide a trellis, moss pole, or support if you prefer a climbing display.

Flowering

Mature plants can produce stunning blooms under the right conditions.

Flower characteristics:

• Star-shaped flowers

• Creamy white petals

• Pink to burgundy centres

• Sweet fragrance, particularly in the evening

To encourage flowering:

• Provide bright light

• Avoid frequent relocation

• Allow the plant to become slightly root-bound

• Maintain consistent care

Do not remove old flower spurs, as future blooms emerge from the same location.

Common Problems

Yellow Leaves

Usually caused by overwatering or poor drainage.

Wrinkled Leaves

Often indicate the plant requires watering.

Slow Growth

Common in younger plants and often linked to insufficient light.

Leaf Drop

May result from sudden temperature changes, overwatering, or environmental stress.

Failure to Flower

Usually due to inadequate light or an immature plant.

Repotting

Hoya kerrii prefers being slightly root-bound.

Repot:

• Every 2–3 years

• When roots begin emerging from drainage holes

Choose a pot only slightly larger than the previous container.

Propagation

Hoya kerrii can be propagated from stem cuttings.

Best method:

• Stem cuttings with at least one node

• Root in water, sphagnum moss, or a chunky propagation mix

Single-leaf cuttings may survive for years but often lack a growth node and may never develop into a full vine.

Why Collectors Love Hoya kerrii

Hoya kerrii combines charming heart-shaped foliage with the resilience of a succulent and the beauty of a flowering houseplant. Its unique appearance, easy-care nature, and potential to produce fragrant blooms have made it one of the most popular Hoya species worldwide. Whether displayed as a single heart-shaped leaf or grown into a mature climbing specimen, Hoya kerrii brings character and charm to any houseplant collection.