Fertilising guide
How to fertilise Blue Violet Iochroma (Iochroma cyaneum)— schedule & NPK
Also called Blue Violet Iochroma, Blue Tubes, Violet Churur.
More about blue violet iochroma
About Blue Violet Iochroma
Iochroma cyaneum · also called Blue Violet Iochroma, Blue Tubes · tropical
Iochroma cyaneum is a fast-growing Andean shrub delivering drooping clusters of vivid violet-blue tubular flowers that hummingbirds and bees find irresistible. It blooms in flushes from spring through autumn in warm climates and performs well as a container plant in cool-temperate conservatories. All parts contain solanine-type alkaloids and are toxic.
Growth habit: Upright, loosely branching evergreen shrub
What fertiliser blue violet iochroma actually wants — and why
Blue Violet Iochroma 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 blue violet iochroma: 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 blue violet iochroma, 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 blue violet iochroma:
Apply a balanced fertiliser (NPK 5-5-5 or similar) every 2 weeks from spring through early autumn. Switch to a high-potash feed (tomato-type) in midsummer to promote flowering. Do not feed from late autumn to late winter. Treat that as every 2 weeks 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 blue violet iochroma 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 blue violet iochroma
Half strength is the safe default for blue violet iochroma — 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 blue violet iochroma first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the blue violet iochroma watering schedule.
Signs you are over-feeding blue violet iochroma
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for blue violet iochroma:
- 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 blue violet iochroma
- 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 blue violet iochroma care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of blue violet iochroma 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 blue violet iochroma
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 blue violet iochroma — frequently asked questions
What fertiliser does blue violet iochroma 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. Blue Violet Iochroma 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 blue violet iochroma?
Apply a balanced fertiliser (NPK 5-5-5 or similar) every 2 weeks from spring through early autumn. Switch to a high-potash feed (tomato-type) in midsummer to promote flowering. Do not feed from late autumn to late winter. Apply a balanced fertiliser (NPK 5-5-5 or similar) every 2 weeks from spring through early autumn. Switch to a high-potash feed (tomato-type) in midsummer to promote flowering. Do not feed from late autumn to late winter. Treat that as every 2 weeks 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 blue violet iochroma?
Half strength is the safe default for blue violet iochroma — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding blue violet iochroma 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 blue violet iochroma 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 blue violet iochroma?
Flush the pot of blue violet iochroma 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
- Blue Violet Iochroma care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water blue violet iochroma — 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 anthurium andraeanum 'kozohara'
- How to fertilise anthurium andraeanum 'midori'
- How to fertilise anthurium andraeanum 'president'
- All 6887 fertilising guides in the Growli library