Fertilising guide
How to fertilise Blanket flower (Gaillardia x grandiflora)— schedule & NPK
Also called Blanket flower, Great blanket flower.
More about blanket flower
About Blanket flower
Gaillardia x grandiflora · also called Blanket flower, Great blanket flower · flowering
A sun-loving, drought-tolerant perennial producing vivid daisy-like flowers in bold combinations of red, orange, and yellow from early summer right through to the first frosts. Outstanding prairie and xeriscape plant. Pet-safe per ASPCA. Requires excellent drainage to persist; tends to be short-lived in heavy, wet soils but reseeds readily.
Growth habit: Upright, clump-forming short-lived herbaceous perennial with deeply lobed or toothed, hairy, grey-green leaves. Large (5–8 cm) solitary flower heads on branching stems; ray florets in red/orange/yellow bands around a raised, domed, reddish-purple disc.
Watch for — Leafhoppers and aster yellows: Leafhoppers transmit aster yellows phytoplasma, causing distorted, yellowed, stunted growth. There is no cure; remove and destroy infected plants immediately. Control leafhopper populations with appropriate insecticides or reflective mulches.
What fertiliser blanket flower actually wants — and why
Blanket flower 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 blanket flower: 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 blanket flower, 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 blanket flower:
Fertilise sparingly or not at all in average soils. An annual light balanced feed in spring is sufficient if growth is weak. Avoid high-nitrogen feeds; rich conditions produce floppy, disease-prone plants and dramatically shorten lifespan. 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 blanket flower 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 blanket flower
Half strength is the safe default for blanket flower — 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 blanket flower first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the blanket flower watering schedule.
Signs you are over-feeding blanket flower
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for blanket flower:
- 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 blanket flower
- 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 blanket flower care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of blanket flower 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 blanket flower
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 blanket flower — frequently asked questions
What fertiliser does blanket flower 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. Blanket flower 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 blanket flower?
Fertilise sparingly or not at all in average soils. An annual light balanced feed in spring is sufficient if growth is weak. Avoid high-nitrogen feeds; rich conditions produce floppy, disease-prone plants and dramatically shorten lifespan. Fertilise sparingly or not at all in average soils. An annual light balanced feed in spring is sufficient if growth is weak. Avoid high-nitrogen feeds; rich conditions produce floppy, disease-prone plants and dramatically shorten lifespan. 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 blanket flower?
Half strength is the safe default for blanket flower — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding blanket flower 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 blanket flower 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 blanket flower?
Flush the pot of blanket flower 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
- Blanket flower care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water blanket flower — 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 china pink
- How to fertilise superb pink
- How to fertilise farewell-to-spring
- All 6887 fertilising guides in the Growli library