Fertilising guide

How to fertilise Scarlet Leucothoe (Leucothoe fontanesiana 'Scarletta')— schedule & NPK

Also called Scarlet Leucothoe, Scarletta Fetterbush, Drooping Leucothoe, Dog Hobble.

More about scarlet leucothoe

About Scarlet Leucothoe

Leucothoe fontanesiana 'Scarletta' · also called Scarlet Leucothoe, Scarletta Fetterbush · flowering

Leucothoe fontanesiana 'Scarletta' (sold under the trade name Zeblid) is a compact, arching, evergreen shrub from the mountain woodlands of the eastern United States, prized for its vivid scarlet-red new growth in spring that matures to glossy dark green before turning rich burgundy in winter, providing year-round colour. It prefers reliably moist, acidic soil in partial to full shade, making it an excellent ground cover under trees and on shaded slopes. The critical care requirement is consistent soil moisture — it wilts rapidly in dry conditions. All parts are toxic to cats, dogs, and horses.

Growth habit: Arching, mounded, evergreen shrub with graceful, fountain-like stems bearing lance-shaped, glossy leaves that change colour through the seasons, and short racemes of white, urn-shaped flowers in late spring.

What fertiliser scarlet leucothoe actually wants — and why

Scarlet Leucothoe is an acid-loving plant — it can only take up nutrients in acidic soil, so the feed itself matters less than using an ericaceous formula and never liming.

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 scarlet leucothoe: 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 scarlet leucothoe, 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 scarlet leucothoe:

Apply a slow-release ericaceous fertiliser in early spring; avoid over-feeding as excessive nitrogen produces soft, disease-prone growth and reduces the intensity of the signature red colouration. In practice: an ericaceous feed in spring as growth resumes, repeated through the main growing months; never apply lime, bonemeal or wood ash, which raise pH.

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

Follow the ericaceous product's own rate — these are formulated for the plant, so the dilution on the label is right for scarlet leucothoe. The variable that actually matters is pH, not concentration.

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

Signs you are over-feeding scarlet leucothoe

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

Brown, scorched leaf margins from too strong or too frequent a dose.
White salt crust on the soil surface.
Soft, lush growth that fruits or flowers poorly.

Signs you are under-feeding scarlet leucothoe

Yellowing leaves with green veins (iron chlorosis from high pH).
Weak growth, poor cropping and an overall pale, stressed look.
Stunted new shoots in spring despite adequate water and light.

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

Flushing and leaching the salts

Flush scarlet leucothoe with rainwater (not hard tap water, which raises pH) if salts build up; better still, mulch with pine needles or composted bark and water with rainwater to hold the acidity.

Organic vs synthetic feeds for scarlet leucothoe

Organic options

Composted pine bark, pine-needle mulch, used coffee grounds and an organic ericaceous feed gently maintain acidity. UK: Vitax or Westland Ericaceous; US: Espoma Holly-tone or Dr. Earth Acid Lovers. Slow, soil-improving, hard to overdo.

Synthetic / liquid feeds

A liquid or granular ericaceous feed — UK: Miracle-Gro Ericaceous, Vitax or Westland; US: Miracle-Gro Acid-Loving Plant Food or Espoma Holly-tone. Pair with rainwater and an acidic mulch for it to work.

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 scarlet leucothoe — frequently asked questions

What fertiliser does scarlet leucothoe need?

An ericaceous (acidic) fertiliser, formulated to keep the soil pH low and supply iron and trace elements in a form acid-loving roots can absorb. Ordinary feeds and any lime lock out iron and yellow the leaves. Scarlet Leucothoe is an acid-loving plant — it can only take up nutrients in acidic soil, so the feed itself matters less than using an ericaceous formula and never liming.

How often should I feed scarlet leucothoe?

Apply a slow-release ericaceous fertiliser in early spring; avoid over-feeding as excessive nitrogen produces soft, disease-prone growth and reduces the intensity of the signature red colouration. Apply a slow-release ericaceous fertiliser in early spring; avoid over-feeding as excessive nitrogen produces soft, disease-prone growth and reduces the intensity of the signature red colouration. In practice: an ericaceous feed in spring as growth resumes, repeated through the main growing months; never apply lime, bonemeal or wood ash, which raise pH.

What strength of feed for scarlet leucothoe?

What does over-feeding scarlet leucothoe look like?

Brown, scorched leaf margins from too strong or too frequent a dose. White salt crust on the soil surface. Soft, lush growth that fruits or flowers poorly. Feeding scarlet leucothoe an ordinary fertiliser, or growing it in hard tap water / limey soil, is the defining mistake — it triggers lime-induced chlorosis (yellow leaves, green veins) no amount of feeding fixes until the pH comes down.

Should I flush the soil of scarlet leucothoe?