Fertilising guide
How to fertilise Greater Coreopsis (Coreopsis major)— schedule & NPK
Also called Greater Coreopsis, Wood Tickseed, Large-flower Tickseed.
More about greater coreopsis
About Greater Coreopsis
Coreopsis major · also called Greater Coreopsis, Wood Tickseed · flowering
Greater Coreopsis is a perennial native to open woodlands and pine barrens of the eastern and southeastern US. It bears bright yellow flowers with a distinctive whorled leaf arrangement on upright stems from early to mid-summer. Unlike most coreopsis, it tolerates partial shade, making it useful in dry, open woodland gardens and naturalistic plantings.
Growth habit: Upright, clump-forming perennial with whorled leaves
What fertiliser greater coreopsis actually wants — and why
Greater Coreopsis 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 greater coreopsis: 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 greater coreopsis, 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 greater coreopsis:
Generally does not require fertilising. On sandy, nutrient-poor soils, a light application of slow-release balanced fertiliser in early spring can support establishment. Avoid excess nitrogen. 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 greater coreopsis 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 greater coreopsis
Half strength is the safe default for greater coreopsis — 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 greater coreopsis first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the greater coreopsis watering schedule.
Signs you are over-feeding greater coreopsis
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for greater coreopsis:
- 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 greater coreopsis
- 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 greater coreopsis care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of greater coreopsis 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 greater coreopsis
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 greater coreopsis — frequently asked questions
What fertiliser does greater coreopsis 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. Greater Coreopsis 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 greater coreopsis?
Generally does not require fertilising. On sandy, nutrient-poor soils, a light application of slow-release balanced fertiliser in early spring can support establishment. Avoid excess nitrogen. Generally does not require fertilising. On sandy, nutrient-poor soils, a light application of slow-release balanced fertiliser in early spring can support establishment. Avoid excess nitrogen. 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 greater coreopsis?
Half strength is the safe default for greater coreopsis — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding greater coreopsis 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 greater coreopsis 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 greater coreopsis?
Flush the pot of greater coreopsis 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
- Greater Coreopsis care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water greater coreopsis — 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 spencer mixed sweet pea
- How to fertilise sweet william
- How to fertilise china pink
- All 6887 fertilising guides in the Growli library