Fertilising guide

How to fertilise Hairy Coreopsis (Coreopsis pubescens)— schedule & NPK

Also called Hairy Coreopsis, Star Tickseed.

More about hairy coreopsis

About Hairy Coreopsis

Coreopsis pubescens · also called Hairy Coreopsis, Star Tickseed · flowering

Hairy Coreopsis is a native perennial wildflower of the southeastern US, named for the fine soft hairs covering its stems and leaves. It produces cheerful golden-yellow daisy flowers on branching stems from mid-summer to early autumn. Well adapted to dry, open woodlands and rocky soils, it tolerates heat and humidity better than many coreopsis species.

Growth habit: Upright to mounding perennial; clump-forming with hairy stems

Watch for — Caterpillar browsing: Several butterfly larvae (including bordered patch butterfly) feed on Coreopsis leaves. Damage is usually minor and supports native wildlife; hand-pick if infestation is severe.

What fertiliser hairy coreopsis actually wants — and why

Hairy Coreopsis flowers best on poor soil — feed it and you get a lush leafy plant with very few blooms, the exact opposite of what you want.

Little or nothing. Rich, especially nitrogen-rich, soil pushes foliage at the expense of flowers in this plant — lean ground is the technique, not a deficiency.

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 hairy 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 hairy 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 hairy coreopsis:

Minimal fertiliser needed. A light top-dressing of compost in spring is sufficient on poor soils. Avoid high-nitrogen fertilisers which promote vegetative growth at the expense of flowers. In practice: no routine feeding at all for hairy coreopsis — at most a thin compost mulch for soil structure, never a flowering or nitrogen feed.

The dormant-season rule matters more than the exact interval: skip feeding entirely when hairy 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 hairy coreopsis

None is the correct answer for hairy coreopsis. The flower-versus-foliage trade-off is the whole point: hold back and you get the display.

Feeding always goes onto already-damp soil, never dry roots — water hairy coreopsis first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the hairy coreopsis watering schedule.

Signs you are over-feeding hairy coreopsis

Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for hairy coreopsis:

Abundant leafy growth and very few flowers (the classic over-rich symptom).
Soft, floppy stems and a sprawling, leafy habit.
Scorched edges and salt crust if it has been fed in a container.

Signs you are under-feeding hairy coreopsis

Effectively never an issue — these plants flower on poverty.
Only on genuinely dead soil: weak, thin growth and few blooms.
A short-lived plant in completely spent container compost.

If the symptoms point at watering, light or roots rather than nutrition, the full hairy coreopsis care brief covers soil, humidity and the common problems for this species.

Flushing and leaching the salts

If hairy coreopsis has accidentally been fed and is all leaf, a plain-water flush plus a move to leaner soil resets it; otherwise no flushing is needed because you are not feeding it.

Organic vs synthetic feeds for hairy coreopsis

Organic options

A thin compost mulch for soil structure is the absolute most; mostly, give it nothing. UK/US: leave it lean — no manure, no liquid feed. Poor soil is the active ingredient here.

Synthetic / liquid feeds

None. Synthetic feeds, particularly anything with appreciable nitrogen, directly suppress flowering in hairy coreopsis.

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 hairy coreopsis — frequently asked questions

What fertiliser does hairy coreopsis need?

Little or nothing. Rich, especially nitrogen-rich, soil pushes foliage at the expense of flowers in this plant — lean ground is the technique, not a deficiency. Hairy Coreopsis flowers best on poor soil — feed it and you get a lush leafy plant with very few blooms, the exact opposite of what you want.

How often should I feed hairy coreopsis?

Minimal fertiliser needed. A light top-dressing of compost in spring is sufficient on poor soils. Avoid high-nitrogen fertilisers which promote vegetative growth at the expense of flowers. Minimal fertiliser needed. A light top-dressing of compost in spring is sufficient on poor soils. Avoid high-nitrogen fertilisers which promote vegetative growth at the expense of flowers. In practice: no routine feeding at all for hairy coreopsis — at most a thin compost mulch for soil structure, never a flowering or nitrogen feed.

What strength of feed for hairy coreopsis?