Fertilising guide
How to fertilise Shield Sundew (Drosera peltata)— schedule & NPK
Also called shield sundew, shield-leaved sundew.
More about shield sundew
About Shield Sundew
Drosera peltata · also called shield sundew, shield-leaved sundew · houseplant
Drosera peltata is a tuberous sundew widespread across Australia, New Zealand, and parts of Asia, recognised by its distinctive peltate (shield-shaped) leaves held on a wiry, upright stem. Like other tuberous sundews it is winter-active and summer-dormant, but its wide geographic range makes it one of the more adaptable tuberous species for cultivation.
Growth habit: Tuberous perennial with a slender, wiry aerial stem reaching 10–40 cm, bearing alternately arranged peltate cauline leaves. Dies fully to a dormant tuber each summer. White or pale pink flowers are borne on lateral or terminal scapes in spring.
What fertiliser shield sundew actually wants — and why
Shield Sundew 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 shield sundew: 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 shield sundew, 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 shield sundew:
Never add fertiliser to the substrate. The plant relies on insect prey for nitrogen and phosphorus. Offer tiny insects (fruit flies, springtails) during active growth if kept indoors without natural prey access. 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 shield sundew 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 shield sundew
Half strength is the safe default for shield sundew — 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 shield sundew first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the shield sundew watering schedule.
Signs you are over-feeding shield sundew
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for shield sundew:
- 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 shield sundew
- 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 shield sundew care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of shield sundew 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 shield sundew
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 shield sundew — frequently asked questions
What fertiliser does shield sundew 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. Shield Sundew 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 shield sundew?
Never add fertiliser to the substrate. The plant relies on insect prey for nitrogen and phosphorus. Offer tiny insects (fruit flies, springtails) during active growth if kept indoors without natural prey access. Never add fertiliser to the substrate. The plant relies on insect prey for nitrogen and phosphorus. Offer tiny insects (fruit flies, springtails) during active growth if kept indoors without natural prey access. 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 shield sundew?
Half strength is the safe default for shield sundew — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding shield sundew 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 shield sundew 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 shield sundew?
Flush the pot of shield sundew 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
- Shield Sundew care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water shield sundew — 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 artillery plant
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- All 6887 fertilising guides in the Growli library