Fertilising guide
How to fertilise Begonia 'Connee Boswell' (Begonia 'Connee Boswell')— schedule & NPK
Also called Connee Boswell Rex Begonia.
More about begonia 'connee boswell'
About Begonia 'Connee Boswell'
Begonia 'Connee Boswell' · also called Connee Boswell Rex Begonia · houseplant
'Connee Boswell' is a rhizomatous Rex begonia prized for spiralled, silvery-pink leaves edged in deep plum. It wants bright indirect light, evenly moist (not soggy) soil, and high humidity to keep its dramatic foliage crisp. A foliage plant grown for leaves rather than blooms, it stays compact and rewards steady, draught-free conditions.
Growth habit: Rhizomatous, mounding foliage plant; the thick surface rhizome creeps outward while spiralled leaves are held on short petioles, giving a low, swirling rosette.
What fertiliser begonia 'connee boswell' actually wants — and why
Begonia 'Connee Boswell' is a genuinely hungry tropical — in bright warmth it pushes growth fast and rewards a regular half-strength balanced feed all season.
A balanced liquid feed (even N-P-K) or a slightly nitrogen-leaning foliage feed — this is a big-leaved foliage plant putting on real size, so it wants steady nitrogen for lush leaves, not a bloom 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 begonia 'connee boswell': 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 begonia 'connee boswell', 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 begonia 'connee boswell':
Feed every 3-4 weeks in spring and summer with a balanced houseplant fertiliser diluted to half strength. Stop feeding in autumn and winter when growth naturally slows or pauses. For a fast grower like this that means feeding regularly — about every 3-4 weeks — right through spring through early autumn (roughly March to September), tapering off only as light drops in autumn.
The dormant-season rule matters more than the exact interval: skip feeding entirely when begonia 'connee boswell' 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 begonia 'connee boswell'
Half strength every feed is the sweet spot for begonia 'connee boswell': frequent enough to fuel fast growth, dilute enough that it never scorches even when you feed often.
Feeding always goes onto already-damp soil, never dry roots — water begonia 'connee boswell' first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the begonia 'connee boswell' watering schedule.
Signs you are over-feeding begonia 'connee boswell'
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for begonia 'connee boswell':
- Brown, scorched leaf tips and margins despite correct watering.
- A white salt crust on the soil or around the pot edge.
- Sudden leaf yellowing and drop shortly after a strong feed.
- Soft, weak, over-stretched growth that cannot support itself.
Signs you are under-feeding begonia 'connee boswell'
- New leaves coming in noticeably smaller than older ones.
- Pale, yellow-green older leaves and slow growth through peak summer.
- A general loss of vigour and gloss in a plant that should be racing away.
If the symptoms point at watering, light or roots rather than nutrition, the full begonia 'connee boswell' care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Because you feed often, salts accumulate faster — flush the pot of begonia 'connee boswell' with plain water until it drains freely roughly every month through the feeding season to keep the root zone clean.
Organic vs synthetic feeds for begonia 'connee boswell'
Organic options
A diluted seaweed or fish-and-seaweed feed plus a yearly top-dress of worm castings supports fast growth without burn risk. UK: Westland seaweed or Baby Bio Organic; US: Neptune's Harvest or Espoma Indoor!.
Synthetic / liquid feeds
A balanced houseplant liquid at half strength applied frequently — UK: Baby Bio, Phostrogen or Westland Houseplant Feed; US: Miracle-Gro Indoor Plant Food or Dyna-Gro Foliage-Pro for steady leafy growth.
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 begonia 'connee boswell' — frequently asked questions
What fertiliser does begonia 'connee boswell' need?
A balanced liquid feed (even N-P-K) or a slightly nitrogen-leaning foliage feed — this is a big-leaved foliage plant putting on real size, so it wants steady nitrogen for lush leaves, not a bloom formula. Begonia 'Connee Boswell' is a genuinely hungry tropical — in bright warmth it pushes growth fast and rewards a regular half-strength balanced feed all season.
How often should I feed begonia 'connee boswell'?
Feed every 3-4 weeks in spring and summer with a balanced houseplant fertiliser diluted to half strength. Stop feeding in autumn and winter when growth naturally slows or pauses. Feed every 3-4 weeks in spring and summer with a balanced houseplant fertiliser diluted to half strength. Stop feeding in autumn and winter when growth naturally slows or pauses. For a fast grower like this that means feeding regularly — about every 3-4 weeks — right through spring through early autumn (roughly March to September), tapering off only as light drops in autumn.
What strength of feed for begonia 'connee boswell'?
Half strength every feed is the sweet spot for begonia 'connee boswell': frequent enough to fuel fast growth, dilute enough that it never scorches even when you feed often.
What does over-feeding begonia 'connee boswell' look like?
Brown, scorched leaf tips and margins despite correct watering. A white salt crust on the soil or around the pot edge. Sudden leaf yellowing and drop shortly after a strong feed. Soft, weak, over-stretched growth that cannot support itself. The mistake here is the opposite of most houseplants: under-feeding a fast tropical in peak season starves it, leaving small, pale new leaves and slow growth — but full-strength doses still burn it, so feed often and weak, not occasionally and strong.
Should I flush the soil of begonia 'connee boswell'?
Because you feed often, salts accumulate faster — flush the pot of begonia 'connee boswell' with plain water until it drains freely roughly every month through the feeding season to keep the root zone clean.
Keep reading
- Begonia 'Connee Boswell' care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water begonia 'connee boswell' — 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 1284 fertilising guides in the Growli library