Fertilising guide
How to fertilise Alsobia 'San Miguel' (Alsobia 'San Miguel')— schedule & NPK
Also called San Miguel alsobia, San Miguel lace flower.
More about alsobia 'san miguel'
About Alsobia 'San Miguel'
Alsobia 'San Miguel' · also called San Miguel alsobia, San Miguel lace flower · flowering
Alsobia 'San Miguel' is a stoloniferous gesneriad grown for fringed white lace flowers over soft, quilted green foliage. A trailing African-violet relative, it spreads on runners like a strawberry and thrives in warm, humid, brightly diffused conditions. Ideal for hanging baskets or terrariums, it stays compact and flowers freely when light and moisture are steady.
Growth habit: Stoloniferous trailing creeper that spreads by sending out runners which root where they touch, much like a strawberry. Forms a low mat or cascades from a basket, with new plantlets at the tips of the stolons.
Watch for — No flowers: Almost always too little light or skipped feeding. Move to a brighter spot out of direct sun and resume a bloom-friendly fertiliser through the growing season.
What fertiliser alsobia 'san miguel' actually wants — and why
Alsobia 'San Miguel' is a heavy-blooming flower with a big appetite — a regular high-potash feed through the season is what drives a long, dense display.
A high-potassium ("high-potash") flowering feed — tomato-style or a dedicated bloom/rose feed. Potassium powers flowering; a high-nitrogen feed gives you a leafy plant with disappointing bloom.
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 alsobia 'san miguel': 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 alsobia 'san miguel', 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 alsobia 'san miguel':
Feed every 2-4 weeks in spring and summer with a balanced or slightly bloom-leaning fertiliser diluted to quarter or half strength. A high-phosphorus African-violet feed encourages flowering. Stop or reduce feeding in winter when growth slows. For a hungry bloomer that means feeding regularly — every 2-4 weeks — right through flowering across the main season (spring through early autumn), tapering as blooming ends.
The dormant-season rule matters more than the exact interval: skip feeding entirely when alsobia 'san miguel' 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 alsobia 'san miguel'
Follow the flowering-feed label rate for alsobia 'san miguel', or half strength if feeding very frequently. These plants genuinely use the nutrients — under-feeding shows up fast as a thin display.
Feeding always goes onto already-damp soil, never dry roots — water alsobia 'san miguel' first if the soil is dry, then apply the diluted feed. The companion question is when to water at all, covered in the alsobia 'san miguel' watering schedule.
Signs you are over-feeding alsobia 'san miguel'
Over-feeding is far more common — and more damaging — than under-feeding for most plants. The classic tells for alsobia 'san miguel':
- Lots of lush leaves but few flowers (too much nitrogen).
- Scorched leaf edges and salt crust from too-strong or too-frequent feeds.
- Soft, sappy growth prone to aphids and mildew.
Signs you are under-feeding alsobia 'san miguel'
- Sparse, small, short-lived flowers and pale foliage.
- A tired plant that stops blooming early in the season.
- Weak growth and poor repeat-flowering after the first flush.
If the symptoms point at watering, light or roots rather than nutrition, the full alsobia 'san miguel' care brief covers soil, humidity and the common problems for this species.
Flushing and leaching the salts
Container-grown alsobia 'san miguel' accumulates feed salts fast with frequent feeding — water until it drains each time and flush pots with plain water every few weeks to prevent scorch.
Organic vs synthetic feeds for alsobia 'san miguel'
Organic options
A liquid comfrey or seaweed feed (naturally potassium-rich) plus compost or well-rotted manure as a mulch. UK: comfrey feed, organic Tomorite, or rose feed; US: Espoma Rose-tone or Neptune's Harvest. Feeds and improves soil.
Synthetic / liquid feeds
A high-potash flowering feed on a regular cadence — UK: Tomorite (Levington), Phostrogen or a specialist rose feed; US: Miracle-Gro Bloom Booster or a rose food. Fast, reliable bloom response.
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 alsobia 'san miguel' — frequently asked questions
What fertiliser does alsobia 'san miguel' need?
A high-potassium ("high-potash") flowering feed — tomato-style or a dedicated bloom/rose feed. Potassium powers flowering; a high-nitrogen feed gives you a leafy plant with disappointing bloom. Alsobia 'San Miguel' is a heavy-blooming flower with a big appetite — a regular high-potash feed through the season is what drives a long, dense display.
How often should I feed alsobia 'san miguel'?
Feed every 2-4 weeks in spring and summer with a balanced or slightly bloom-leaning fertiliser diluted to quarter or half strength. A high-phosphorus African-violet feed encourages flowering. Stop or reduce feeding in winter when growth slows. Feed every 2-4 weeks in spring and summer with a balanced or slightly bloom-leaning fertiliser diluted to quarter or half strength. A high-phosphorus African-violet feed encourages flowering. Stop or reduce feeding in winter when growth slows. For a hungry bloomer that means feeding regularly — every 2-4 weeks — right through flowering across the main season (spring through early autumn), tapering as blooming ends.
What strength of feed for alsobia 'san miguel'?
Follow the flowering-feed label rate for alsobia 'san miguel', or half strength if feeding very frequently. These plants genuinely use the nutrients — under-feeding shows up fast as a thin display.
What does over-feeding alsobia 'san miguel' look like?
Lots of lush leaves but few flowers (too much nitrogen). Scorched leaf edges and salt crust from too-strong or too-frequent feeds. Soft, sappy growth prone to aphids and mildew. Using a high-nitrogen general feed on alsobia 'san miguel' is the headline mistake — you grow a big leafy plant with few flowers. The second is simply under-feeding a genuinely hungry bloomer and getting a sparse, short display.
Should I flush the soil of alsobia 'san miguel'?
Container-grown alsobia 'san miguel' accumulates feed salts fast with frequent feeding — water until it drains each time and flush pots with plain water every few weeks to prevent scorch.
Keep reading
- Alsobia 'San Miguel' care — the full brief (light, soil, humidity, problems, pet safety)
- How often to water alsobia 'san miguel' — 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 3899 fertilising guides in the Growli library