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Fertilising guide

How to fertilise Dragon Arum (Dracunculus vulgaris)— schedule & NPK

Also called dragon arum, dragon lily, stink lily, voodoo lily.

More about dragon arum

About Dragon Arum

Dracunculus vulgaris · also called dragon arum, dragon lily · flowering

Dracunculus vulgaris is a dramatic Mediterranean tuberous perennial famous for its huge deep-maroon spathe and long black spadix that reek of carrion for a day or two to lure pollinating flies. Its dragon-like mottled stems and divided leaves rise in spring; it loves sun, sharp drainage and a dry summer dormancy.

Growth habit: Deciduous tuberous perennial sending up a single tall, purple-mottled pseudostem topped with a divided leaf and one large spathe, then dying back to a fat tuber for summer dormancy.

What fertiliser dragon arum actually wants — and why

Dragon Arum 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 dragon arum: 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 dragon arum, 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 dragon arum:

Feed lightly: a balanced fertiliser or compost mulch as growth begins in spring, with an optional half-strength liquid feed before flowering. Stop feeding once foliage starts to die back for dormancy. 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 dragon arum 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 dragon arum

Half strength is the safe default for dragon arum — 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 dragon arum first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the dragon arum watering schedule.

Signs you are over-feeding dragon arum

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

Signs you are under-feeding dragon arum

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

Flushing and leaching the salts

Flush the pot of dragon arum 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 dragon arum

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 dragon arum — frequently asked questions

What fertiliser does dragon arum 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. Dragon Arum 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 dragon arum?

Feed lightly: a balanced fertiliser or compost mulch as growth begins in spring, with an optional half-strength liquid feed before flowering. Stop feeding once foliage starts to die back for dormancy. Feed lightly: a balanced fertiliser or compost mulch as growth begins in spring, with an optional half-strength liquid feed before flowering. Stop feeding once foliage starts to die back for dormancy. 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 dragon arum?

Half strength is the safe default for dragon arum — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.

What does over-feeding dragon arum 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 dragon arum 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 dragon arum?

Flush the pot of dragon arum 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.

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