Fertilising guide
How to fertilise Henry's Lily (Lilium henryi)— schedule & NPK
Also called Henry's Lily, Orange Speciosum Lily.
More about henry's lily
About Henry's Lily
Lilium henryi · also called Henry's Lily, Orange Speciosum Lily · flowering
Henry's Lily is a vigorous Chinese species producing arching stems up to 3 m tall laden with 10–20 pendant, apricot-orange, black-spotted turk's-cap flowers per stem in midsummer. One of the most lime-tolerant true lilies, it thrives in alkaline soil — unusual in the genus. Excellent for naturalising in shade. Toxic to cats.
Growth habit: Very tall, arching perennial bulb with long stems that may need staking; leaves are alternate and glossy; flowers are pendant with strongly reflexed petals and prominent orange-tipped stamens arranged in a long raceme.
What fertiliser henry's lily actually wants — and why
Henry's Lily 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.
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.
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 henry's lily: 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 henry's lily, 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 henry's lily:
Apply a balanced general-purpose granular fertiliser in early spring. After flowering, top-dress with a high-potassium feed to replenish bulb energy. Unlike acid-loving relatives, it accepts standard (non-ericaceous) fertilisers. Avoid excess nitrogen which causes tall, weak stems prone to wind damage. 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 henry's lily 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 henry's lily
Follow the ericaceous product's own rate — these are formulated for the plant, so the dilution on the label is right for henry's lily. The variable that actually matters is pH, not concentration.
Feeding always goes onto already-damp soil, never dry roots — water henry's lily first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the henry's lily watering schedule.
Signs you are over-feeding henry's lily
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for henry's lily:
- 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 henry's lily
- 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 henry's lily care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush henry's lily 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 henry's lily
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 henry's lily — frequently asked questions
What fertiliser does henry's lily 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. Henry's Lily 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 henry's lily?
Apply a balanced general-purpose granular fertiliser in early spring. After flowering, top-dress with a high-potassium feed to replenish bulb energy. Unlike acid-loving relatives, it accepts standard (non-ericaceous) fertilisers. Avoid excess nitrogen which causes tall, weak stems prone to wind damage. Apply a balanced general-purpose granular fertiliser in early spring. After flowering, top-dress with a high-potassium feed to replenish bulb energy. Unlike acid-loving relatives, it accepts standard (non-ericaceous) fertilisers. Avoid excess nitrogen which causes tall, weak stems prone to wind damage. 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 henry's lily?
Follow the ericaceous product's own rate — these are formulated for the plant, so the dilution on the label is right for henry's lily. The variable that actually matters is pH, not concentration.
What does over-feeding henry's lily 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 henry's lily 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 henry's lily?
Flush henry's lily 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.
Keep reading
- Henry's Lily care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water henry's lily — 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 mahonia aquifolium apollo
- How to fertilise mahonia soft caress
- How to fertilise mahonia winter sun
- All 6887 fertilising guides in the Growli library