Repotting guide

When & how to repot American Basswood (Tilia americana)

Also called American Basswood, American Linden, Basswood.

More about american basswood

About American Basswood

Tilia americana · also called American Basswood, American Linden · flowering

A large, stately deciduous tree native to eastern North America, prized for its intensely fragrant summer flowers beloved by pollinators. Thrives in full sun to part shade in moist, fertile soil. Hardy across a wide range of climates and tolerant of various soil types, though sensitive to road salt and compacted soils.

Mature size: 15–24 m tall (50–80 ft), 9–15 m wide (30–50 ft)

How to tell american basswood needs repotting

Repotting on a calendar is less reliable than reading the plant. For american basswood, watch for these signs:

Thick roots out of the drainage holes, or circling the surface and lifting the plant.
The pot dries out unusually fast and american basswood wilts between waterings it used to shrug off.
The plant is visibly top-heavy and tips over easily.
Stalled growth and small new leaves over a full season — though with a big specimen, top-dressing is often the better first response before a full 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 american basswood

Every 2–3 years; top-dress in the in-between years. American Basswood's growth habit — broadly pyramidal when young, becoming rounded and spreading with age; large deciduous tree with ascending branches — sets the pace. A large, stately deciduous tree native to eastern North America, prized for its intensely fragrant summer flowers beloved by pollinators. Thrives in full sun to part shade in moist, fertile soil. Hardy across a wide range of climates and tolerant of various soil types, though sensitive to road salt and compacted soils.

What size pot to step american basswood up to

Move up exactly one pot size. A heavy american basswood dropped into a vastly bigger pot sits in a reservoir of wet soil its roots cannot reach, which rots them and destabilises the plant. In the years between repots, lift off and replace the top 3–5 cm of soil (top-dressing) instead — it refreshes nutrients without the shock of a full repot.

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 american basswood

Early spring, just as new growth restarts, is the ideal window for american basswood. 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 american basswood

Consider top-dressing first. If american basswood is not badly root-bound, scrape off and replace the top 3–5 cm of soil instead — far less shock for a big plant that hates moving.
Get help and one size up. For a full repot, choose a pot just one size larger. A heavy plant needs two people and a stable, free-draining pot.
Ease it out on its side. Lay the plant down, slide the pot off, and gently loosen the outer roots. Do not bare-root a mature specimen.
Repot at the same depth. Add fresh moist, fertile, well-drained loam or clay loam beneath and around the rootball, keeping the original soil line. Firm it so the trunk is stable and upright.
Water and leave it put. Water thoroughly, then leave american basswood in the same spot and light — moving and repotting at once is what makes it drop leaves.

Aftercare

Leave american basswood in exactly the same spot and light it was in before — moving and repotting at the same time is what makes a big specimen drop leaves. Water it in well, then let the top of the soil dry before watering again so the larger volume of fresh soil does not stay sodden. Do not fertilise for about 4 weeks — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for american basswood

American Basswood wants moist, fertile, well-drained loam or clay loam. Adaptable to sandy, loamy, and clay soils. Tolerates mildly acidic to mildly alkaline pH (5.5–7.5). Avoid waterlogged sites and road-salt exposure; plant at least 9 m from heavily salted roads. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting american basswood — frequently asked questions

How often should you repot american basswood?

Every 2–3 years; top-dress in the in-between years for american basswood. Fully repot american basswood only every 2–3 years; in the in-between years just top-dress the top 3–5 cm of soil. Step up one pot size in spring with moist, fertile, well-drained loam or clay loam. It is heavy and hates being moved, and a vastly oversized pot holds water against the roots and rots them.

What size pot does american basswood need?

When is the best time of year to repot american basswood?

Should you top-dress or fully repot american basswood?

For a big, heavy american basswood, top-dressing — replacing the top 3–5 cm of soil — is the gentler option most years, with a full repot only every 2–3 years. A mature specimen sulks and drops leaves when fully repotted, so do it as rarely as the roots allow.

Should you fertilise american basswood after repotting?

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