Fertilising guide
How to fertilise Thessalian Aubrieta (Aubrieta thessala)— schedule & NPK
Also called Thessalian aubrieta, Rock cress, False rock cress.
More about thessalian aubrieta
About Thessalian Aubrieta
Aubrieta thessala · also called Thessalian aubrieta, Rock cress · flowering
Aubrieta thessala is a mat-forming evergreen perennial native to rocky limestone habitats in Greece and the Balkans. It thrives in full sun with sharply drained, alkaline to neutral soil and is a classic choice for dry stone walls, rock gardens, and scree beds. The single most important care point is to trim the plant hard immediately after flowering to prevent it becoming leggy and to encourage a compact second flush of growth. Not listed by the ASPCA; considered non-toxic to pets by most horticultural sources, though confirm with a vet if ingestion is suspected.
Growth habit: Prostrate, mat-forming evergreen perennial spreading via trailing stems.
What fertiliser thessalian aubrieta actually wants — and why
Thessalian Aubrieta 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 thessalian aubrieta: 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 thessalian aubrieta, 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 thessalian aubrieta:
Apply a light top-dressing of grit and a low-nitrogen fertiliser in early spring; avoid high-nitrogen feeds that promote soft, disease-prone 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 thessalian aubrieta 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 thessalian aubrieta
Half strength is the safe default for thessalian aubrieta — 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 thessalian aubrieta first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the thessalian aubrieta watering schedule.
Signs you are over-feeding thessalian aubrieta
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for thessalian aubrieta:
- 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 thessalian aubrieta
- 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 thessalian aubrieta care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of thessalian aubrieta 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 thessalian aubrieta
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 thessalian aubrieta — frequently asked questions
What fertiliser does thessalian aubrieta 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. Thessalian Aubrieta 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 thessalian aubrieta?
Apply a light top-dressing of grit and a low-nitrogen fertiliser in early spring; avoid high-nitrogen feeds that promote soft, disease-prone growth. Apply a light top-dressing of grit and a low-nitrogen fertiliser in early spring; avoid high-nitrogen feeds that promote soft, disease-prone 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 thessalian aubrieta?
Half strength is the safe default for thessalian aubrieta — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding thessalian aubrieta 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 thessalian aubrieta 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 thessalian aubrieta?
Flush the pot of thessalian aubrieta 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
- Thessalian Aubrieta care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water thessalian aubrieta — 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 gymnocarpium dryopteris 'plumosum'
- How to fertilise dryopteris dilatata
- How to fertilise dryopteris dilatata 'crispa whiteside'
- All 10153 fertilising guides in the Growli library