Fertilising guide
How to fertilise Martagon Lily (Lilium martagon)— schedule & NPK
Also called Martagon Lily, Turk's Cap Lily, Common Turk's Cap.
More about martagon lily
About Martagon Lily
Lilium martagon · also called Martagon Lily, Turk's Cap Lily · flowering
Martagon Lily is a vigorous woodland species bearing up to 50 pendant, reflexed-petal flowers in pink-purple with dark spotting per stem. It excels in dappled shade and humus-rich soil, making it one of the few true lilies suited to shaded borders. Extremely toxic to cats; all parts cause acute kidney failure.
Growth habit: Tall, upright perennial bulb with whorled leaves along the stem and pendant, reflexed turk's-cap flowers arranged in a raceme.
What fertiliser martagon lily actually wants — and why
Martagon Lily 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 martagon 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 martagon 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 martagon lily:
Top-dress with balanced slow-release granules (e.g. 10-10-10) in early spring as shoots emerge. Supplement with a high-potassium liquid feed after flowering to replenish the bulb. Avoid high-nitrogen feeds which promote foliage at the expense of bulb vigour. 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 martagon 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 martagon lily
Half strength is the safe default for martagon lily — 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 martagon lily first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the martagon lily watering schedule.
Signs you are over-feeding martagon lily
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for martagon lily:
- 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 martagon lily
- 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 martagon lily care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of martagon lily 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 martagon lily
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 martagon lily — frequently asked questions
What fertiliser does martagon lily 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. Martagon Lily 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 martagon lily?
Top-dress with balanced slow-release granules (e.g. 10-10-10) in early spring as shoots emerge. Supplement with a high-potassium liquid feed after flowering to replenish the bulb. Avoid high-nitrogen feeds which promote foliage at the expense of bulb vigour. Top-dress with balanced slow-release granules (e.g. 10-10-10) in early spring as shoots emerge. Supplement with a high-potassium liquid feed after flowering to replenish the bulb. Avoid high-nitrogen feeds which promote foliage at the expense of bulb vigour. 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 martagon lily?
Half strength is the safe default for martagon lily — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding martagon lily 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 martagon lily 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 martagon lily?
Flush the pot of martagon lily 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
- Martagon Lily care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water martagon 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 campanula glomerata 'superba'
- How to fertilise campanula portenschlagiana
- How to fertilise campanula poscharskyana
- All 6887 fertilising guides in the Growli library