Repotting guide

When & how to repot Alsobia 'San Miguel' (Alsobia 'San Miguel')

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.

Mature size: Trails 30-60 cm from a basket; individual rosettes stay low at 5-10 cm tall, spreading indefinitely via runners.

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.

How to tell alsobia 'san miguel' needs repotting

Repotting on a calendar is less reliable than reading the plant. For alsobia 'san miguel', watch for these signs:

Roots spiralling thickly out of the drainage holes or pushing the whole plant up out of the pot.
The pot is so packed that water runs straight through in seconds and barely wets the soil.
It has split a plastic pot, or the rootball is a solid mass with almost no soil left when you slide it out.
Growth and (for alsobia 'san miguel') flowering have clearly stalled despite good light and feeding — but remember this plant likes being snug, so a little crowding alone is not a reason to repot.

For the underlying biology of a pot-bound root system and why it stalls a plant, see our guide to spotting and fixing a root-bound plant.

How often to repot alsobia 'san miguel'

Only every 2–4 years, when genuinely crowded. Alsobia 'San Miguel' is one of the plants that genuinely prefers a snug pot — it grows and flowers better with its roots a little restricted, so resist the urge to repot it on schedule. 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..

What size pot to step alsobia 'san miguel' up to

Go up only one pot size — roughly 2–3 cm (about an inch) wider in diameter, no more. Alsobia 'San Miguel' positively prefers a snug pot: it flowers and grows better when the roots are a little restricted. The single biggest repotting mistake here is over-potting — dropping alsobia 'san miguel' into a pot two or three sizes up. All that surplus soil holds water the small root system cannot use, stays cold and wet, and rots the roots within weeks. When in doubt, choose the smaller pot.

Not sure of the exact diameter? Our pot size calculator takes the current pot and root spread and tells you the right next size — it deliberately recommends a single step up, never a big jump.

The best time of year to repot alsobia 'san miguel'

Early spring, just as new growth restarts, is the ideal window for alsobia 'san miguel'. The plant is moving into its strongest growth phase and re-roots into fresh soil quickly. Avoid repotting in winter dormancy or, for flowering plants, while it is in bud or bloom — recovery is slowest then and you risk dropping the flowers.

Step-by-step: repotting alsobia 'san miguel'

Confirm it actually needs it. Slide alsobia 'san miguel' out and check the roots. Only continue if it is genuinely packed — this plant prefers a snug pot, so if there is still soil and room, put it straight back.
Pick a pot only one size up. Choose a pot just 2–3 cm wider with good drainage. Resist anything bigger; over-potting is the main killer here.
Ease it out gently. Water lightly the day before, then tip alsobia 'san miguel' out, supporting the base. Tease the outer roots free only enough to stop them circling.
Repot at the same depth. Add a layer of fresh light, airy african-violet or gesneriad mix, set the plant so the soil line sits exactly where it did before, and backfill around the sides, firming lightly.
Settle it in. Water once to settle the soil, then let it sit. Hold off on more water until the top of the soil dries — fresh soil around a small root system stays wet for a while.

Aftercare

Because the new soil holds more water than the old crammed rootball did, ease right back on watering — let the top of the soil dry before you water alsobia 'san miguel' again, or you will rot the roots in the very pot you just moved it to. Keep it out of harsh direct sun for a fortnight. Do not fertilise for about 4 weeks — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for alsobia 'san miguel'

Alsobia 'San Miguel' wants light, airy african-violet or gesneriad mix. Use a peat- or coir-based mix lightened with perlite and a little fine bark so it drains fast yet holds moisture. A pinch of horticultural charcoal helps in terrariums. Good aeration around the shallow roots prevents the crown and stolons from rotting. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting alsobia 'san miguel' — frequently asked questions

How often should you repot alsobia 'san miguel'?

Only every 2–4 years, when genuinely crowded for alsobia 'san miguel'. Only repot alsobia 'san miguel' every 2–4 years, and only when it is genuinely root-bound — it flowers and grows best slightly crowded. Step up just one pot size in spring using light, airy african-violet or gesneriad mix. The key mistake is over-potting: a too-big pot stays wet and rots the roots.

What size pot does alsobia 'san miguel' need?

When is the best time of year to repot alsobia 'san miguel'?

Does alsobia 'san miguel' like to be root-bound?

Yes — alsobia 'san miguel' genuinely flowers and grows best when slightly pot-bound, so do not rush to repot it. The mistake to avoid is over-potting into a much larger pot: the excess soil stays wet, the roots cannot use it, and the plant rots. Only repot every few years and only one snug size up.

Should you fertilise alsobia 'san miguel' after repotting?

Not immediately. Wait about 4 weeks after repotting alsobia 'san miguel'. Fresh mix already contains nutrients, and feeding freshly cut or disturbed roots burns them. Resume your normal feeding routine once you see new growth.