Fertilising guide
How to fertilise Purple Heart (Tradescantia pallida)— schedule & NPK
Also called Purple Heart, Purple Queen, Purple Secretia, Setcreasea, Purple Spiderwort, Purple Wandering Jew.
More about purple heart
About Purple Heart
Tradescantia pallida · also called Purple Heart, Purple Queen · houseplant
Purple Heart (Tradescantia pallida) is a fast-growing trailing houseplant prized for vivid violet-purple foliage. Give it the brightest light you can for deepest colour, let the top inch of soil dry between waterings, and pinch to keep it bushy. The ASPCA classes the Tradescantia genus as toxic, so keep it away from pets.
Growth habit: Fast-growing, trailing/cascading and spreading herbaceous perennial with succulent, jointed stems. Excellent in hanging baskets or as a cascading accent; pinch stem tips above a leaf node to encourage bushy, compact growth.
What fertiliser purple heart actually wants — and why
Purple Heart 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 purple heart: 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 purple heart, 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 purple heart:
Feed once a month during the spring and summer growing season with a balanced, diluted liquid houseplant fertiliser. Stop feeding in autumn and winter when growth naturally slows. Over-feeding can cause weak, leggy stems. Treat that as once a month 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 purple heart 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 purple heart
Half strength is the safe default for purple heart — 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 purple heart first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the purple heart watering schedule.
Signs you are over-feeding purple heart
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for purple heart:
- 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 purple heart
- 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 purple heart care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of purple heart 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 purple heart
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 purple heart — frequently asked questions
What fertiliser does purple heart 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. Purple Heart 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 purple heart?
Feed once a month during the spring and summer growing season with a balanced, diluted liquid houseplant fertiliser. Stop feeding in autumn and winter when growth naturally slows. Over-feeding can cause weak, leggy stems. Feed once a month during the spring and summer growing season with a balanced, diluted liquid houseplant fertiliser. Stop feeding in autumn and winter when growth naturally slows. Over-feeding can cause weak, leggy stems. Treat that as once a month 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 purple heart?
Half strength is the safe default for purple heart — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding purple heart 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 purple heart 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 purple heart?
Flush the pot of purple heart 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
- Purple Heart care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water purple heart — 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 snake plant
- How to fertilise dracaena
- How to fertilise peperomia
- All 389 fertilising guides in the Growli library