Repotting guide

When & how to repot Philadelphus microphyllus (Philadelphus microphyllus)

Also called littleleaf mock orange, desert mock orange.

More about philadelphus microphyllus

About Philadelphus microphyllus

Philadelphus microphyllus · also called littleleaf mock orange, desert mock orange · flowering

Philadelphus microphyllus is a small, wiry deciduous shrub native to the southwestern United States, with tiny leaves and intensely fragrant single white flowers in early summer that smell of pineapple. Far more drought-tolerant than garden mock oranges, it suits dry, sunny, rocky sites and naturalistic plantings on lean, sharply drained soil.

Mature size: 0.9-1.5 m tall and wide (3-5 ft)

Watch for — Root rot in wet soil: Adapted to dry, fast-draining ground, it suffers in heavy or waterlogged soil; plant on a slope or in gritty soil and avoid overwatering.

How to tell philadelphus microphyllus needs repotting

Repotting on a calendar is less reliable than reading the plant. For philadelphus microphyllus, 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 philadelphus microphyllus

Every 2–3 years, into bone-dry mix. Philadelphus microphyllus's growth habit — small, twiggy, densely branched deciduous shrub with slender wiry stems and very small leaves, giving a fine, compact texture. — sets the pace. Philadelphus microphyllus is a small, wiry deciduous shrub native to the southwestern United States, with tiny leaves and intensely fragrant single white flowers in early summer that smell of pineapple. Far more drought-tolerant than garden mock oranges, it suits dry, sunny, rocky sites and naturalistic plantings on lean, sharply drained soil.

What size pot to step philadelphus microphyllus up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Philadelphus microphyllus 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 philadelphus microphyllus

Spring or summer, while philadelphus microphyllus 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 philadelphus microphyllus

Repot dry. Do not water philadelphus microphyllus 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 lean, gritty, sharply drained 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 philadelphus microphyllus 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 philadelphus microphyllus 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 philadelphus microphyllus

Philadelphus microphyllus wants lean, gritty, sharply drained. Thrives on rocky, sandy, or gravelly soils including alkaline and limy ground; excellent drainage is critical and it dislikes rich, moisture-retentive soil. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting philadelphus microphyllus — frequently asked questions

How often should you repot philadelphus microphyllus?

Every 2–3 years, into bone-dry mix for philadelphus microphyllus. Repot philadelphus microphyllus every 2–3 years into a snug pot of lean, gritty, sharply drained, 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 philadelphus microphyllus need?

When is the best time of year to repot philadelphus microphyllus?

Should you water philadelphus microphyllus after repotting?

No — not straight away. Repot philadelphus microphyllus 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 philadelphus microphyllus after repotting?

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