Fertilising guide

How to fertilise African Violet 'Optimara' (Streptocarpus sect. Saintpaulia 'Optimara')— schedule & NPK

Also called Optimara African violet, miniature African violet.

More about african violet 'optimara'

About African Violet 'Optimara'

Streptocarpus sect. Saintpaulia 'Optimara' · also called Optimara African violet, miniature African violet · flowering

'Optimara' African violets are a popular bred series of Saintpaulia (now placed in Streptocarpus), compact rosettes of fuzzy leaves that bloom nearly year-round in soft light. They reward steady warmth, bright indirect light and careful bottom-watering with clusters of violet, pink or white flowers, and they are reassuringly safe around cats and dogs.

Growth habit: A compact, symmetrical rosette of fuzzy, rounded leaves with near-continuous clusters of five-petalled flowers held just above the foliage.

Watch for — Failure to bloom: Almost always too little light or too much nitrogen. Move to bright indirect light and switch to a high-phosphorus violet feed.

What fertiliser african violet 'optimara' actually wants — and why

African Violet 'Optimara' is feeding to flower, not to grow leaves — it needs a higher-phosphorus / specialist bloom feed, given little and often, to set and hold its display.

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 african violet 'optimara': 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 african violet 'optimara', 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 african violet 'optimara':

Feed every 2 weeks during active growth with a dilute high-phosphorus African violet fertiliser to encourage continuous flowering. Ease off slightly in the lower light of winter. The pattern that matters: feed little and often through active growth and budding — every 2 weeks — and ease right off during the rest period that triggers the next flush.

The dormant-season rule matters more than the exact interval: skip feeding entirely when african violet 'optimara' 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 african violet 'optimara'

Very dilute — quarter strength, the classic "weakly, weekly" approach for african violet 'optimara'. These plants have fine roots that scorch easily and a steady trickle beats an occasional strong dose for flowering.

Feeding always goes onto already-damp soil, never dry roots — water african violet 'optimara' first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the african violet 'optimara' watering schedule.

Signs you are over-feeding african violet 'optimara'

Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for african violet 'optimara':

Lush green leaves but few or no flowers (too much nitrogen).
Brown, scorched leaf tips and edges — a classic fine-root burn.
White salt crust on the medium or pot, and stalled buds.
Bud blast: buds forming then shrivelling and dropping.

Signs you are under-feeding african violet 'optimara'

Sparse or no flowering despite good light and the right season.
Smaller, paler new leaves and a generally weak, tired plant.
Flowers that are smaller or fade faster than they should.

If the symptoms point at watering, light or roots rather than nutrition, the full african violet 'optimara' care brief covers soil, humidity and the common problems for this species.

Flushing and leaching the salts

Specialist and bloom feeds leave salts that scorch fine roots — flush african violet 'optimara' thoroughly with plain water until it runs clear every 4-6 weeks in the feeding season, and always between feeds for orchids.

Organic vs synthetic feeds for african violet 'optimara'

Organic options

Gentler options exist: a dilute seaweed feed (mildly potassium-rich) or worm-casting tea. UK: Westland seaweed, or a dilute tomato feed like Tomorite for bud-formers; US: Espoma Orchid! / Violet! or Neptune's Harvest. Lower burn risk, slower response.

Synthetic / liquid feeds

A species-matched bloom feed at quarter strength — UK: Baby Bio Orchid / African Violet food, or a high-potash Tomorite/Phostrogen for budding bloomers; US: Miracle-Gro Orchid or Bloom Booster, Schultz African Violet.

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 african violet 'optimara' — frequently asked questions

What fertiliser does african violet 'optimara' need?

A higher-phosphorus "bloom" formula or a species-specific feed (orchid food, African violet food, or a tomato-style high-potash/phosphorus liquid). A high-nitrogen general feed gives you lush leaves and almost no flowers. African Violet 'Optimara' is feeding to flower, not to grow leaves — it needs a higher-phosphorus / specialist bloom feed, given little and often, to set and hold its display.

How often should I feed african violet 'optimara'?

Feed every 2 weeks during active growth with a dilute high-phosphorus African violet fertiliser to encourage continuous flowering. Ease off slightly in the lower light of winter. Feed every 2 weeks during active growth with a dilute high-phosphorus African violet fertiliser to encourage continuous flowering. Ease off slightly in the lower light of winter. The pattern that matters: feed little and often through active growth and budding — every 2 weeks — and ease right off during the rest period that triggers the next flush.

What strength of feed for african violet 'optimara'?

What does over-feeding african violet 'optimara' look like?

Lush green leaves but few or no flowers (too much nitrogen). Brown, scorched leaf tips and edges — a classic fine-root burn. White salt crust on the medium or pot, and stalled buds. Bud blast: buds forming then shrivelling and dropping. Using an ordinary high-nitrogen houseplant feed on african violet 'optimara' is the headline mistake — you get a healthy-looking plant that simply refuses to bloom. The second is feeding through the rest period and breaking the dormancy cue it needs to set buds.

Should I flush the soil of african violet 'optimara'?