Fertilising guide
How to fertilise Calathea Freddie (Goeppertia concinna 'Freddie')— schedule & NPK
Also called Calathea Freddie, Freddie prayer plant, Calathea concinna 'Freddie', Calathea leopardina.
More about calathea freddie
About Calathea Freddie
Goeppertia concinna 'Freddie' · also called Calathea Freddie, Freddie prayer plant · houseplant
Calathea Freddie is a compact, clumping prayer plant grown for its slim, lance-shaped leaves striped in light and dark green. It wants bright indirect light, evenly moist soil, and high humidity, and it folds its leaves up at night. It is non-toxic to cats and dogs per the ASPCA.
Growth habit: Compact, upright, clumping perennial. New shoots emerge from the soil around the parent plant, forming a dense rosette of slim, patterned leaves that fold upward at night (nyctinasty) and lower during the day.
Watch for — Crispy brown leaf edges: Usually low humidity or a build-up of minerals, fluoride, chlorine or salts from tap water. Raise humidity above 50% and switch to filtered, distilled or rainwater; trim crisped edges off for looks.
What fertiliser calathea freddie actually wants — and why
Calathea Freddie 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 calathea freddie: 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 calathea freddie, 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 calathea freddie:
Feed monthly during the growing season (spring through summer) with a balanced houseplant fertiliser diluted to half strength. Do not feed in autumn and winter. Calatheas burn easily, so flush the soil occasionally and back off feeding if leaf tips brown or curl from salt build-up. 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 calathea freddie 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 calathea freddie
Half strength is the safe default for calathea freddie — 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 calathea freddie first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the calathea freddie watering schedule.
Signs you are over-feeding calathea freddie
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for calathea freddie:
- 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 calathea freddie
- 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 calathea freddie care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Flush the pot of calathea freddie 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 calathea freddie
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 calathea freddie — frequently asked questions
What fertiliser does calathea freddie 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. Calathea Freddie 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 calathea freddie?
Feed monthly during the growing season (spring through summer) with a balanced houseplant fertiliser diluted to half strength. Do not feed in autumn and winter. Calatheas burn easily, so flush the soil occasionally and back off feeding if leaf tips brown or curl from salt build-up. Feed monthly during the growing season (spring through summer) with a balanced houseplant fertiliser diluted to half strength. Do not feed in autumn and winter. Calatheas burn easily, so flush the soil occasionally and back off feeding if leaf tips brown or curl from salt build-up. 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 calathea freddie?
Half strength is the safe default for calathea freddie — houseplant feeds are formulated strong, and the diluted dose is gentler on the roots while still ample for foliage.
What does over-feeding calathea freddie 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 calathea freddie 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 calathea freddie?
Flush the pot of calathea freddie 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
- Calathea Freddie care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water calathea freddie — 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 609 fertilising guides in the Growli library