Repotting guide

When & how to repot Greater Periwinkle (Vinca major)

Also called Greater Periwinkle, Big Periwinkle, Large Periwinkle.

More about greater periwinkle

About Greater Periwinkle

Vinca major · also called Greater Periwinkle, Big Periwinkle · flowering

A vigorous, trailing evergreen groundcover with large glossy leaves and bright violet-blue flowers from spring through early summer. Faster-growing and coarser than lesser periwinkle, it excels in shaded banks, containers, and hanging baskets. Hardy to USDA zone 7 but treated as an annual in colder climates.

Mature size: 20–40 cm tall; spreads 90–180 cm or more; trailing stems can reach 1–2 m in a single season

Watch for — Root and stem rot: Phytophthora and Pythium rots occur in poorly drained or overwatered conditions, causing rapid wilting and blackened stem bases. Improve drainage, avoid overhead irrigation, and do not over-water. Remove and dispose of affected plants; do not replant Vinca in the same spot without improving drainage.

How to tell greater periwinkle needs repotting

Repotting on a calendar is less reliable than reading the plant. For greater periwinkle, 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 greater periwinkle) 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 greater periwinkle

Only every 2–4 years, when genuinely crowded. Greater Periwinkle 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. Trailing to semi-erect evergreen sub-shrub; stems root at nodes where they contact soil.

What size pot to step greater periwinkle up to

Go up only one pot size — roughly 2–3 cm (about an inch) wider in diameter, no more. Greater Periwinkle 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 greater periwinkle 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 greater periwinkle

Early spring, just as new growth restarts, is the ideal window for greater periwinkle. 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 greater periwinkle

Confirm it actually needs it. Slide greater periwinkle 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 greater periwinkle 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 moist, humus-rich, well-draining loam, 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 greater periwinkle 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 greater periwinkle

Greater Periwinkle wants moist, humus-rich, well-draining loam. Prefers fertile soils with good organic matter content. Tolerates pH 6.0–7.5. Amend sandy soils with compost to improve water retention; improve clay with coarse grit. Avoid prolonged wet feet, which lead to root and stem rots. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting greater periwinkle — frequently asked questions

How often should you repot greater periwinkle?

Only every 2–4 years, when genuinely crowded for greater periwinkle. Only repot greater periwinkle 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 moist, humus-rich, well-draining loam. The key mistake is over-potting: a too-big pot stays wet and rots the roots.

What size pot does greater periwinkle need?

When is the best time of year to repot greater periwinkle?

Does greater periwinkle like to be root-bound?

Yes — greater periwinkle 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 greater periwinkle after repotting?

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