Repotting guide

When & how to repot Hoya Carnosa 'Rubra' (Hoya carnosa 'Rubra')

Also called Rubra Wax Plant.

More about hoya carnosa 'rubra'

About Hoya Carnosa 'Rubra'

Hoya carnosa 'Rubra' · also called Rubra Wax Plant · houseplant

Hoya carnosa 'Rubra', often sold as 'Krimson Queen', is a vining wax plant with thick leaves variegated creamy-pink and green, new growth flushing rosy red. It climbs or trails, prefers bright indirect light, and stores water in succulent leaves. Mature plants reward patience with fragrant, star-shaped flower clusters. Pet-safe and long-lived.

Mature size: Vines reach 1.5-4 m (5-13 ft) over years when trained; readily kept shorter with pruning.

Watch for — Won't flower: Usually too little light, too much feeding, or repotting too often. Give brighter indirect light, leave it slightly pot-bound, and never cut off the old flower spurs (peduncles).

How to tell hoya carnosa 'rubra' needs repotting

Repotting on a calendar is less reliable than reading the plant. For hoya carnosa 'rubra', watch for these signs:

Roots growing out of the drainage holes, or the rootball lifting the plant proud of the rim.
Soil that has shrunk away from the pot sides and no longer holds water.
The pot is unstable because the plant has grown top-heavy.
Old, compacted, broken-down mix that stays wet too long — for a succulent that is a rot risk, so refresh it even if the pot size is fine.

For the underlying biology of a pot-bound root system and why it stalls a plant, see our guide to spotting and fixing a root-bound plant.

How often to repot hoya carnosa 'rubra'

Every 2–3 years, into bone-dry mix. Hoya Carnosa 'Rubra''s growth habit — twining, climbing or trailing vine with thick waxy leaves. climbs a trellis or moss pole and cascades from hanging pots. flowers form on perennial spurs (peduncles) that should never be removed, as they rebloom year after year. — sets the pace. Hoya carnosa 'Rubra', often sold as 'Krimson Queen', is a vining wax plant with thick leaves variegated creamy-pink and green, new growth flushing rosy red. It climbs or trails, prefers bright indirect light, and stores water in succulent leaves. Mature plants reward patience with fragrant, star-shaped flower clusters. Pet-safe and long-lived.

What size pot to step hoya carnosa 'rubra' up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Hoya Carnosa 'Rubra' stores water and rots in a large pot of slow-drying soil. A tight terracotta pot that dries fast is far safer than a generous plastic one. Never up-pot a succulent by several sizes.

Not sure of the exact diameter? Our pot size calculator takes the current pot and root spread and tells you the right next size — it deliberately recommends a single step up, never a big jump.

The best time of year to repot hoya carnosa 'rubra'

Spring or summer, while hoya carnosa 'rubra' is in active growth and warm, is best — roots recover fastest then, and the plant is not sitting in cool damp soil. Avoid repotting a succulent in winter dormancy.

Step-by-step: repotting hoya carnosa 'rubra'

Repot dry. Do not water hoya carnosa 'rubra' for several days first. Working with dry roots and dry mix dramatically lowers the rot risk for a succulent.
Pick a snug, fast-draining pot. Choose terracotta one size up at most, with a drainage hole. Have gritty chunky, very free-draining epiphytic mix ready.
Tip it out and clean the roots. Slide the plant out, crumble off the old soil, and trim any black, mushy or dead roots with clean snips.
Pot into dry mix. Set hoya carnosa 'rubra' at its original depth in dry gritty mix, firming gently. Do not bury the stem deeper than it was.
Wait a week before watering. Leave it completely dry and out of harsh sun for about 7 days so any damaged roots callus. Only then water lightly.

Aftercare

Keep hoya carnosa 'rubra' completely dry and out of fierce sun for about a week so any nicked roots callus before they meet moisture; watering a freshly repotted succulent is the classic way to rot it. Then resume the normal lean, dry rhythm. Do not fertilise for about 3 weeks — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for hoya carnosa 'rubra'

Hoya Carnosa 'Rubra' wants chunky, very free-draining epiphytic mix. Use a loose blend of orchid bark, perlite, and potting mix (or coir), mimicking the airy substrate of an epiphyte. Excellent drainage and aeration are essential. Hoyas bloom better slightly pot-bound, so resist over-potting. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting hoya carnosa 'rubra' — frequently asked questions

How often should you repot hoya carnosa 'rubra'?

Every 2–3 years, into bone-dry mix for hoya carnosa 'rubra'. Repot hoya carnosa 'rubra' every 2–3 years into a snug pot of chunky, very free-draining epiphytic mix, ideally in spring or summer. Let it sit in dry soil and do not water for about a week afterwards so any nicked roots can callus. Over-potting and watering straight away is what rots succulents.

What size pot does hoya carnosa 'rubra' need?

When is the best time of year to repot hoya carnosa 'rubra'?

Should you water hoya carnosa 'rubra' after repotting?

No — not straight away. Repot hoya carnosa 'rubra' into dry mix and wait about a week before the first watering so any damaged roots callus over. Watering a freshly repotted succulent is the single most common way to rot one.

Should you fertilise hoya carnosa 'rubra' after repotting?

Not immediately. Wait about 3 weeks after repotting hoya carnosa 'rubra'. Fresh mix already contains nutrients, and feeding freshly cut or disturbed roots burns them. Resume your normal feeding routine once you see new growth.