Repotting guide

When & how to repot Nemesia strumosa 'Poetry Blue' (Nemesia strumosa 'Poetry Blue')

Also called Poetry Blue Nemesia, Blue Cape Jewels.

More about nemesia strumosa 'poetry blue'

About Nemesia strumosa 'Poetry Blue'

Nemesia strumosa 'Poetry Blue' · also called Poetry Blue Nemesia, Blue Cape Jewels · flowering

'Poetry Blue' is a compact South African Nemesia bearing masses of small two-lipped lavender-blue flowers over bushy foliage from late spring through summer. A cool-season bedding and container favourite, it flowers best in mild weather, likes sun with even moisture and rich soil, and reblooms strongly if trimmed back when the first flush tires.

Mature size: 20-30 cm tall with a 15-25 cm spread.

Watch for — Yellowing from drying out or alkaline soil: Leaves yellow when roots dry out or the soil is too alkaline. Maintain even moisture, use slightly acidic compost and feed regularly.

How to tell nemesia strumosa 'poetry blue' needs repotting

Repotting on a calendar is less reliable than reading the plant. For nemesia strumosa 'poetry blue', 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 nemesia strumosa 'poetry blue') 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 nemesia strumosa 'poetry blue'

Only every 2–4 years, when genuinely crowded. Nemesia strumosa 'Poetry Blue' 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. Compact, bushy and upright-mounding, branching freely from the base to form a neat clump for bedding, edging and container fillers..

What size pot to step nemesia strumosa 'poetry blue' up to

Go up only one pot size — roughly 2–3 cm (about an inch) wider in diameter, no more. Nemesia strumosa 'Poetry Blue' 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 nemesia strumosa 'poetry blue' 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 nemesia strumosa 'poetry blue'

Early spring, just as new growth restarts, is the ideal window for nemesia strumosa 'poetry blue'. 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 nemesia strumosa 'poetry blue'

Confirm it actually needs it. Slide nemesia strumosa 'poetry blue' 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 nemesia strumosa 'poetry blue' 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 fertile, humus-rich, moisture-retentive but free-draining compost, 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 nemesia strumosa 'poetry blue' 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 nemesia strumosa 'poetry blue'

Nemesia strumosa 'Poetry Blue' wants fertile, humus-rich, moisture-retentive but free-draining compost. Rich, well-drained, slightly acidic soil or quality peat-free compost suits it; it dislikes alkaline, dry or waterlogged ground. Add organic matter to beds and grit to heavy soils for drainage. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting nemesia strumosa 'poetry blue' — frequently asked questions

How often should you repot nemesia strumosa 'poetry blue'?

Only every 2–4 years, when genuinely crowded for nemesia strumosa 'poetry blue'. Only repot nemesia strumosa 'poetry blue' 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 fertile, humus-rich, moisture-retentive but free-draining compost. The key mistake is over-potting: a too-big pot stays wet and rots the roots.

What size pot does nemesia strumosa 'poetry blue' need?

When is the best time of year to repot nemesia strumosa 'poetry blue'?

Does nemesia strumosa 'poetry blue' like to be root-bound?

Yes — nemesia strumosa 'poetry blue' 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 nemesia strumosa 'poetry blue' after repotting?

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