Hoya lacunosa Care Guide

Hoya lacunosa sulcata is bought for its surface. The leaves are small, slightly cupped and quilted, and the silver veining runs across them in a pattern that looks engraved rather than painted on. Collectors treat it as the ornamental end of the lacunosa group and grow it in the brightest spot they can spare, because the marking is the whole point of the plant and it is the first thing a dim position takes away. The plant is also compact enough to keep in a small pot on a shelf, which is how most of them are grown.

Growing Hoya lacunosa

• LightBright filtered light — stronger light keeps the silver veiningThis one reads the light directly. In a bright filtered position the silver veining sits proud on a quilted surface; in shade the same leaves flatten out and go dull green over a few months. An east window, or a metre back from a south window, is the range to aim for.
• WaterLet the mix dry to the top third between wateringsDry to the top third, then water through and let the pot drain. The quilted leaves hold a little more water than their size suggests, so the mix matters as much as the interval: a chunky mix that dries evenly to the third between waterings is what keeps this species moving.
• Humidity55% – 75% relative humidity once acclimatisedThe nursery holds 70% – 85% RH with air movement and the plant settles into 55% – 75% after acclimatisation. That upper range is the point: this species keeps cleaner, quilted leaves in moister air, and dry air leaves the edges of the silver marking thin and papery. A humid room with a fan suits it better than a still one.
• SubstrateChunky epiphytic mix — bark, perlite and coco coirBark, perlite and coco coir, with the bark at a medium grade. The mix has to dry evenly rather than in pockets, because a sulking plant in a wet, dense mix stalls at the growing tip and takes a season to start again. Repot only when the roots are visibly crowded.
• Temperature18 °C – 30 °CBetween 18 °C and 30 °C suits it, and it does not want a cold window behind it in winter. Warmth with bright light keeps the growth coming; a cool, dim corner is the combination that makes this species sit still and lose the silver from the new leaves.
• PropagationTwo-node stem cuttings in damp sphagnumTwo nodes in damp sphagnum under a plastic cover, the same method as the rest of the genus. Take the cutting from firm growth rather than a soft tip, and keep it in bright filtered light while it roots so the silver comes through in the first leaves the cutting makes.

Habit is trailing and dense rather than aggressive. Left alone, the stems hang and layer over each other, and the plant makes a full, textured mound in a hanging pot in about the time a fast Hoya takes to reach the end of a trellis. It is not the fussiest of the genus but it sulks: move it into shade and the silver retreats into the newest leaves, keep it wet and the growth stops at the tip. Bright filtered light and a mix that dries to the top third between waterings keep it steady all year.

Bare-root export and transit

Bare-root transit suits this species rather better than its fussy reputation suggests. The stems are thin and the leaves small, so the whole plant washes free of substrate without much root loss, takes the anti-fungal and bactericide dip, and wraps down into sterile Chilean AAA damp sphagnum without bulk. Packed in an EPS-insulated box inside a corrugated carton and held between 18 °C and 24 °C, it holds condition for 7 – 10 days. The silver marking comes through the transit intact, which matters when the marking is the reason the plant is being sold.

Questions buyers ask