Repotting guide

When & how to repot Stern's medlar (Mespilus canescens)

Also called Stern's medlar, hoary medlar.

More about stern's medlar

About Stern's medlar

Mespilus canescens · also called Stern's medlar, hoary medlar · edible

A critically rare North American native (known from a single site in eastern Arkansas), Stern's medlar is a multi-stemmed deciduous shrub or small tree in the rose family. It bears white spring flowers and small, glossy deep-red pomes edible when bletted. Suited to USDA zones 6–8, it prefers moist, fertile, well-drained soil in sun to part shade.

Mature size: 4.5–6 m tall × 3.5–5.5 m wide (15–20 ft tall, 12–18 ft wide)

Watch for — Root rot in wet soils: Poor drainage leads to root rot and rapid decline. Ensure excellent drainage, especially on clay soils; plant on raised beds or mounded soil if necessary. No serious insect pests have been reported in cultivation.

How to tell stern's medlar needs repotting

Repotting on a calendar is less reliable than reading the plant. For stern's medlar, watch for these signs:

Roots growing out of the drainage holes, or the rootball lifting the plant proud of the rim.
Soil that has shrunk away from the pot sides and no longer holds water.
The pot is unstable because the plant has grown top-heavy.
Old, compacted, broken-down mix that stays wet too long — for a succulent that is a rot risk, so refresh it even if the pot size is fine.

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 stern's medlar

Every 2–3 years, into bone-dry mix. Stern's medlar's growth habit — multi-stemmed deciduous shrub or small tree; rounded, spreading canopy; moderate growth rate; white five-petalled flowers in spring; persistent red pomes in autumn — sets the pace. A critically rare North American native (known from a single site in eastern Arkansas), Stern's medlar is a multi-stemmed deciduous shrub or small tree in the rose family. It bears white spring flowers and small, glossy deep-red pomes edible when bletted. Suited to USDA zones 6–8, it prefers moist, fertile, well-drained soil in sun to part shade.

What size pot to step stern's medlar up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Stern's medlar stores water and rots in a large pot of slow-drying soil. A tight terracotta pot that dries fast is far safer than a generous plastic one. Never up-pot a succulent by several sizes.

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 stern's medlar

Spring or summer, while stern's medlar is in active growth and warm, is best — roots recover fastest then, and the plant is not sitting in cool damp soil. Avoid repotting a succulent in winter dormancy.

Step-by-step: repotting stern's medlar

Repot dry. Do not water stern's medlar for several days first. Working with dry roots and dry mix dramatically lowers the rot risk for a succulent.
Pick a snug, fast-draining pot. Choose terracotta one size up at most, with a drainage hole. Have gritty moist, fertile, well-drained loam; tolerates gritty or sandy soils ready.
Tip it out and clean the roots. Slide the plant out, crumble off the old soil, and trim any black, mushy or dead roots with clean snips.
Pot into dry mix. Set stern's medlar at its original depth in dry gritty mix, firming gently. Do not bury the stem deeper than it was.
Wait a week before watering. Leave it completely dry and out of harsh sun for about 7 days so any damaged roots callus. Only then water lightly.

Aftercare

Keep stern's medlar completely dry and out of fierce sun for about a week so any nicked roots callus before they meet moisture; watering a freshly repotted succulent is the classic way to rot it. Then resume the normal lean, dry rhythm. Do not fertilise for about 3 weeks — fresh mix already carries nutrients and feeding freshly disturbed roots scorches them.

The right soil mix for stern's medlar

Stern's medlar wants moist, fertile, well-drained loam; tolerates gritty or sandy soils. Performs best in organically rich loams with good drainage. Its native Grand Prairie habitat features fine-textured, seasonally moist soils. Avoid heavy clay that holds water after rain. Neutral to slightly acid pH preferred. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting stern's medlar — frequently asked questions

How often should you repot stern's medlar?

Every 2–3 years, into bone-dry mix for stern's medlar. Repot stern's medlar every 2–3 years into a snug pot of moist, fertile, well-drained loam; tolerates gritty or sandy soils, ideally in spring or summer. Let it sit in dry soil and do not water for about a week afterwards so any nicked roots can callus. Over-potting and watering straight away is what rots succulents.

What size pot does stern's medlar need?

When is the best time of year to repot stern's medlar?

Should you water stern's medlar after repotting?

No — not straight away. Repot stern's medlar into dry mix and wait about a week before the first watering so any damaged roots callus over. Watering a freshly repotted succulent is the single most common way to rot one.

Should you fertilise stern's medlar after repotting?

Not immediately. Wait about 3 weeks after repotting stern's medlar. Fresh mix already contains nutrients, and feeding freshly cut or disturbed roots burns them. Resume your normal feeding routine once you see new growth.