Fertilising guide
How to fertilise Gaillardia 'Sun Devil' (Gaillardia 'Sun Devil')— schedule & NPK
Also called Sun Devil blanket flower, blanket flower, Indian blanket.
More about gaillardia 'sun devil'
About Gaillardia 'Sun Devil'
Gaillardia 'Sun Devil' · also called Sun Devil blanket flower, blanket flower · flowering
Gaillardia 'Sun Devil' is a compact blanket flower producing vivid red and gold bicoloured daisy blooms from early summer to first frost. It is remarkably heat-tolerant and thrives in poor, well-drained soils. Gaillardia is not listed as toxic to dogs or cats by the ASPCA; some individuals may experience mild contact irritation.
Growth habit: Compact, spreading herbaceous perennial
What fertiliser gaillardia 'sun devil' actually wants — and why
Gaillardia 'Sun Devil' 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 gaillardia 'sun devil': 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 gaillardia 'sun devil', 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 gaillardia 'sun devil':
Do not over-fertilise — rich soil shortens plant life. At most, apply a single light dressing of low-nitrogen slow-release granules in spring. Feeding is largely unnecessary in lean garden soils. 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 gaillardia 'sun devil' 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 gaillardia 'sun devil'
Half strength is the safe default for gaillardia 'sun devil' — 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 gaillardia 'sun devil' first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the gaillardia 'sun devil' watering schedule.
Signs you are over-feeding gaillardia 'sun devil'
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for gaillardia 'sun devil':
- 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 gaillardia 'sun devil'
- 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 gaillardia 'sun devil' care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of gaillardia 'sun devil' 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 gaillardia 'sun devil'
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 gaillardia 'sun devil' — frequently asked questions
What fertiliser does gaillardia 'sun devil' 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. Gaillardia 'Sun Devil' 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 gaillardia 'sun devil'?
Do not over-fertilise — rich soil shortens plant life. At most, apply a single light dressing of low-nitrogen slow-release granules in spring. Feeding is largely unnecessary in lean garden soils. Do not over-fertilise — rich soil shortens plant life. At most, apply a single light dressing of low-nitrogen slow-release granules in spring. Feeding is largely unnecessary in lean garden soils. 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 gaillardia 'sun devil'?
Half strength is the safe default for gaillardia 'sun devil' — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding gaillardia 'sun devil' 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 gaillardia 'sun devil' 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 gaillardia 'sun devil'?
Flush the pot of gaillardia 'sun devil' 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
- Gaillardia 'Sun Devil' care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water gaillardia 'sun devil' — the watering schedule
- The houseplant fertiliser schedule — feeding through the year
- NPK ratio explained — what the three numbers on the bottle mean
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- All 11687 fertilising guides in the Growli library