Repotting guide

When & how to repot Agapanthus inapertus subsp. pendulus (Agapanthus inapertus subsp. pendulus)

Also called drooping agapanthus, nodding-flower agapanthus.

More about agapanthus inapertus subsp. pendulus

About Agapanthus inapertus subsp. pendulus

Agapanthus inapertus subsp. pendulus · also called drooping agapanthus, nodding-flower agapanthus · flowering

Agapanthus inapertus subsp. pendulus is a tall, deciduous species distinguished by pendent, tubular deep-blue flowers that hang rather than open flat, carried on upright stems well above the foliage in late summer. Its narrow, drooping flower heads give an elegant, architectural look. It is reasonably hardy, wanting full sun and free-draining soil to thrive.

Mature size: 90-120 cm tall in flower and 45-60 cm wide, among the taller agapanthus and useful for height at the back of a sunny border.

Watch for — Poor flowering after division: Recently split clumps sulk for a year or more. Leave roots undisturbed and slightly congested to encourage free flowering.

How to tell agapanthus inapertus subsp. pendulus needs repotting

Repotting on a calendar is less reliable than reading the plant. For agapanthus inapertus subsp. pendulus, 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 agapanthus inapertus subsp. pendulus) 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 agapanthus inapertus subsp. pendulus

Only every 2–4 years, when genuinely crowded. Agapanthus inapertus subsp. pendulus 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. Tall, clump-forming herbaceous perennial with upright, somewhat glaucous strap-leaves and long bare scapes carrying narrow heads of pendent, tubular flowers; deciduous in winter..

What size pot to step agapanthus inapertus subsp. pendulus up to

Go up only one pot size — roughly 2–3 cm (about an inch) wider in diameter, no more. Agapanthus inapertus subsp. pendulus 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 agapanthus inapertus subsp. pendulus 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 agapanthus inapertus subsp. pendulus

Early spring, just as new growth restarts, is the ideal window for agapanthus inapertus subsp. pendulus. 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 agapanthus inapertus subsp. pendulus

Confirm it actually needs it. Slide agapanthus inapertus subsp. pendulus 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 agapanthus inapertus subsp. pendulus 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, free-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 agapanthus inapertus subsp. pendulus 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 agapanthus inapertus subsp. pendulus

Agapanthus inapertus subsp. pendulus wants fertile, free-draining loam. Prefers a moisture-retentive yet sharply drained soil; add grit on heavy ground. The deep root system appreciates depth, so plant in a well-prepared, open border position. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting agapanthus inapertus subsp. pendulus — frequently asked questions

How often should you repot agapanthus inapertus subsp. pendulus?

Only every 2–4 years, when genuinely crowded for agapanthus inapertus subsp. pendulus. Only repot agapanthus inapertus subsp. pendulus 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, free-draining loam. The key mistake is over-potting: a too-big pot stays wet and rots the roots.

What size pot does agapanthus inapertus subsp. pendulus need?

When is the best time of year to repot agapanthus inapertus subsp. pendulus?

Does agapanthus inapertus subsp. pendulus like to be root-bound?

Yes — agapanthus inapertus subsp. pendulus 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 agapanthus inapertus subsp. pendulus after repotting?

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