Fertilising guide
How to fertilise Cushion Draba (Draba bruniifolia)— schedule & NPK
Also called Cushion Draba, Brunii-leaved Whitlow Grass.
More about cushion draba
About Cushion Draba
Draba bruniifolia · also called Cushion Draba, Brunii-leaved Whitlow Grass · flowering
Cushion Draba is a tight-mounding alpine perennial from the Caucasus and Turkey, forming dense evergreen cushions of minute hairy rosettes studded with bright yellow flowers in early to mid-spring. A classic rock garden and alpine trough plant, it is fully frost-hardy and thrives in open scree conditions with perfect drainage and full sun.
Growth habit: Dense, cushion-forming evergreen perennial with tightly packed rosettes
What fertiliser cushion draba actually wants — and why
Cushion Draba 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 cushion draba: 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 cushion draba, 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 cushion draba:
No regular feeding needed. An optional light top-dressing of grit mixed with a very small amount of slow-release alpine fertiliser in early spring can support flowering without promoting lush, rot-susceptible growth. 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 cushion draba 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 cushion draba
Half strength is the safe default for cushion draba — 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 cushion draba first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the cushion draba watering schedule.
Signs you are over-feeding cushion draba
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for cushion draba:
- 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.
Signs you are under-feeding cushion draba
- Uniformly pale or yellow-green leaves, oldest first.
- Noticeably small new leaves and stalled growth in good light and season.
- A generally tired, lacklustre look despite correct watering and light.
If the symptoms point at watering, light or roots rather than nutrition, the full cushion draba care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of cushion draba 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 cushion draba
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 cushion draba — frequently asked questions
What fertiliser does cushion draba 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. Cushion Draba 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 cushion draba?
No regular feeding needed. An optional light top-dressing of grit mixed with a very small amount of slow-release alpine fertiliser in early spring can support flowering without promoting lush, rot-susceptible growth. No regular feeding needed. An optional light top-dressing of grit mixed with a very small amount of slow-release alpine fertiliser in early spring can support flowering without promoting lush, rot-susceptible growth. 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 cushion draba?
Half strength is the safe default for cushion draba — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding cushion draba 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 cushion draba 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 cushion draba?
Flush the pot of cushion draba 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
- Cushion Draba care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water cushion draba — the watering schedule
- The houseplant fertiliser schedule — feeding through the year
- NPK ratio explained — what the three numbers on the bottle mean
- How to fertilise yellow crocus
- How to fertilise pretty crocus
- How to fertilise dwarf crocus
- All 8452 fertilising guides in the Growli library