Growli
Let's go

Fertilising guide

How to fertilise Purple Vygie (Drosanthemum hispidum)— schedule & NPK

Also called Purple Vygie, Hairy Dewflower, Purple Ice Plant.

More about purple vygie

About Purple Vygie

Drosanthemum hispidum · also called Purple Vygie, Hairy Dewflower · flowering

A distinctive, mat-forming succulent from South Africa, covered in fine hair-like papillae that give leaves a dewy shimmer and stems a fuzzy appearance — hence 'hairy dewflower'. In summer it produces a vivid display of bright pink to reddish-purple, daisy-like flowers. Drought-hardy to -7°C when dry, it suits gravel gardens, sunny banks, and containers in frost-light climates.

Growth habit: Mat-forming, spreading succulent subshrub with rough hairy stems and cylindrical, pale green to red-flushed succulent leaves

What fertiliser purple vygie actually wants — and why

Purple Vygie is an easy, light foliage feeder — a half-strength balanced liquid feed through the growing months keeps it green without forcing weak, sappy growth.

A balanced general houseplant feed (roughly even N-P-K) is exactly right — it is grown for foliage, so steady, moderate nitrogen for healthy leaves is the goal, not a bloom or root formula.

For the language behind the three numbers on the bottle — what nitrogen, phosphorus and potassium each do — see the NPK ratio explained entry. The short version for purple vygie: match the feed to the job the plant is doing right now, not to a generic “plant food” on the shelf.

How often to feed purple vygie, and which months

Feeding only earns its keep while the plant is in active growth and can use the nutrients — pour feed into a dormant or low-light plant and it simply builds up as root-burning salt. For purple vygie:

Apply a single dose of low-nitrogen, high-potassium liquid fertiliser (e.g. diluted tomato feed) at the start of spring. No additional feeding is required or beneficial — excess nitrogen reduces flowering and hardens cold tolerance. Treat that as sparingly through the growing season between spring through early autumn (roughly March to September); ease off in autumn and stop entirely in the low light of winter.

The dormant-season rule matters more than the exact interval: skip feeding entirely when purple vygie is resting. For the wider context on indoor feeding rhythms across the seasons, the houseplant fertiliser schedule walks through the year month by month.

What strength to mix for purple vygie

Half strength is the safe default for purple vygie — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.

Feeding always goes onto already-damp soil, never dry roots — water purple vygie first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the purple vygie watering schedule.

Signs you are over-feeding purple vygie

Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for purple vygie:

Signs you are under-feeding purple vygie

If the symptoms point at watering, light or roots rather than nutrition, the full purple vygie care brief covers soil, humidity and the common problems for this species.

Flushing and leaching the salts

Flush the pot of purple vygie with plain water until it runs freely from the base every couple of months in the feeding season — it washes out the fertiliser salts that cause brown tips.

Organic vs synthetic feeds for purple vygie

Organic options

A diluted seaweed or worm-casting feed, or fish emulsion if you can tolerate the smell indoors. UK: Westland or Baby Bio Organic, dilute seaweed; US: Espoma Indoor! or Neptune's Harvest fish & seaweed. Slow, gentle and hard to overdo.

Synthetic / liquid feeds

A general-purpose houseplant liquid at half strength — UK: Baby Bio, Westland Houseplant Feed or Phostrogen; US: Miracle-Gro Indoor Plant Food or Schultz. Convenient and fast-acting; the only risk is overdoing it.

Brand names are examples, not endorsements, and UK and US ranges differ — check the label’s own NPK and dilution rate, since formulations change.

Fertilising purple vygie — frequently asked questions

What fertiliser does purple vygie need?

A balanced general houseplant feed (roughly even N-P-K) is exactly right — it is grown for foliage, so steady, moderate nitrogen for healthy leaves is the goal, not a bloom or root formula. Purple Vygie is an easy, light foliage feeder — a half-strength balanced liquid feed through the growing months keeps it green without forcing weak, sappy growth.

How often should I feed purple vygie?

Apply a single dose of low-nitrogen, high-potassium liquid fertiliser (e.g. diluted tomato feed) at the start of spring. No additional feeding is required or beneficial — excess nitrogen reduces flowering and hardens cold tolerance. Apply a single dose of low-nitrogen, high-potassium liquid fertiliser (e.g. diluted tomato feed) at the start of spring. No additional feeding is required or beneficial — excess nitrogen reduces flowering and hardens cold tolerance. Treat that as sparingly through the growing season between spring through early autumn (roughly March to September); ease off in autumn and stop entirely in the low light of winter.

What strength of feed for purple vygie?

Half strength is the safe default for purple vygie — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.

What does over-feeding purple vygie look like?

Brown, crispy leaf tips and edges with no sign of underwatering. A white, crusty salt deposit on the soil surface or pot rim. Weak, pale, stretched new growth that flops. Lower leaves yellow and drop while the soil is correctly watered. Feeding purple vygie year-round on a fixed schedule, including dark winter months, is the most common mistake — it cannot use the nutrients in low light and the surplus simply burns the roots and crusts the soil.

Should I flush the soil of purple vygie?

Flush the pot of purple vygie with plain water until it runs freely from the base every couple of months in the feeding season — it washes out the fertiliser salts that cause brown tips.

Keep reading