Fertilising guide
How to fertilise Blood-red Bertolonia (Bertolonia sanguinea)— schedule & NPK
Also called Blood-red Bertolonia, Crimson Jewel Plant.
More about blood-red bertolonia
About Blood-red Bertolonia
Bertolonia sanguinea · also called Blood-red Bertolonia, Crimson Jewel Plant · tropical
Blood-red Bertolonia is a striking Brazilian tropical notable for its rich, deep crimson-red undersides and dark, velvety green upper leaf surfaces with silver striping. Native to the humid Atlantic Forest understorey, it demands terrarium conditions — high humidity, warmth, and shade — and rewards specialist growers with one of the most dramatic leaf colorations in the genus.
Growth habit: Compact, low rosette-forming herb with shortly creeping rhizomes
What fertiliser blood-red bertolonia actually wants — and why
Blood-red Bertolonia 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 blood-red bertolonia: 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 blood-red bertolonia, 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 blood-red bertolonia:
Feed monthly at quarter-strength with a balanced liquid fertiliser (20-20-20 or similar) only during active growth in spring and summer. Do not fertilise in autumn or winter. Excess fertiliser salts damage the fine root system and cause leaf tip burn. Treat that as monthly 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 blood-red bertolonia 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 blood-red bertolonia
Half strength is the safe default for blood-red bertolonia — 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 blood-red bertolonia first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the blood-red bertolonia watering schedule.
Signs you are over-feeding blood-red bertolonia
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for blood-red bertolonia:
- 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 blood-red bertolonia
- 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 blood-red bertolonia care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of blood-red bertolonia 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 blood-red bertolonia
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 blood-red bertolonia — frequently asked questions
What fertiliser does blood-red bertolonia 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. Blood-red Bertolonia 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 blood-red bertolonia?
Feed monthly at quarter-strength with a balanced liquid fertiliser (20-20-20 or similar) only during active growth in spring and summer. Do not fertilise in autumn or winter. Excess fertiliser salts damage the fine root system and cause leaf tip burn. Feed monthly at quarter-strength with a balanced liquid fertiliser (20-20-20 or similar) only during active growth in spring and summer. Do not fertilise in autumn or winter. Excess fertiliser salts damage the fine root system and cause leaf tip burn. Treat that as monthly 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 blood-red bertolonia?
Half strength is the safe default for blood-red bertolonia — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding blood-red bertolonia 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 blood-red bertolonia 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 blood-red bertolonia?
Flush the pot of blood-red bertolonia 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
- Blood-red Bertolonia care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water blood-red bertolonia — the watering schedule
- The houseplant fertiliser schedule — feeding through the year
- NPK ratio explained — what the three numbers on the bottle mean
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- All 8452 fertilising guides in the Growli library