Repotting guide

When & how to repot Passiflora incarnata (Passiflora incarnata)

Also called maypop, purple passionflower, wild apricot.

More about passiflora incarnata

About Passiflora incarnata

Passiflora incarnata · also called maypop, purple passionflower · flowering

Passiflora incarnata, the maypop, is a hardy herbaceous perennial vine native to the southeastern United States. It bears intricate lavender-and-white fringed flowers in summer followed by egg-shaped edible fruit. Dying back to the ground in winter and regrowing from the root, it is the most cold-tolerant passionflower and spreads readily by suckers.

Mature size: 2-6 m of annual climbing or scrambling growth from the root each season; spreads widely by suckers if unchecked.

Watch for — Aggressive suckering: Spreads vigorously by underground runners and can colonise nearby beds; site where it can roam or contain the roots, and pull up unwanted suckers.

How to tell passiflora incarnata needs repotting

Repotting on a calendar is less reliable than reading the plant. For passiflora incarnata, 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 passiflora incarnata) 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 passiflora incarnata

Only every 2–4 years, when genuinely crowded. Passiflora incarnata 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. Vigorous herbaceous tendril-climbing vine that dies back to the rootstock in winter and resprouts in spring; spreads by underground suckers and can become invasive..

What size pot to step passiflora incarnata up to

Go up only one pot size — roughly 2–3 cm (about an inch) wider in diameter, no more. Passiflora incarnata 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 passiflora incarnata 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 passiflora incarnata

Early spring, just as new growth restarts, is the ideal window for passiflora incarnata. 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 passiflora incarnata

Confirm it actually needs it. Slide passiflora incarnata 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 passiflora incarnata 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 average to fertile, well-drained loam or sandy soil; tolerant of a wide ph, 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 passiflora incarnata 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 passiflora incarnata

Passiflora incarnata wants average to fertile, well-drained loam or sandy soil; tolerant of a wide ph. Adapts to most well-drained soils, from sandy to loamy, and to slightly acidic through neutral conditions. Overly rich soil promotes leaf at the expense of flowers; good drainage is key. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting passiflora incarnata — frequently asked questions

How often should you repot passiflora incarnata?

Only every 2–4 years, when genuinely crowded for passiflora incarnata. Only repot passiflora incarnata 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 average to fertile, well-drained loam or sandy soil; tolerant of a wide ph. The key mistake is over-potting: a too-big pot stays wet and rots the roots.

What size pot does passiflora incarnata need?

When is the best time of year to repot passiflora incarnata?

Does passiflora incarnata like to be root-bound?

Yes — passiflora incarnata 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 passiflora incarnata after repotting?

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