Repotting guide

When & how to repot Yellow Mountain Heath (Phyllodoce glanduliflora)

Also called Yellow Mountain Heath, Yellow Mountain Heather, Glandular-flowered Mountain Heath.

More about yellow mountain heath

About Yellow Mountain Heath

Phyllodoce glanduliflora · also called Yellow Mountain Heath, Yellow Mountain Heather · flowering

Phyllodoce glanduliflora is a low-growing evergreen subshrub native to alpine and subalpine zones of western North America from Oregon and Wyoming northward to Alaska, distinguished by its pale yellowish-white, glandular-hairy urn-shaped flowers in late spring and early summer. It naturally occurs above 1,500 m on moist, rocky or sandy slopes with peaty soils and requires cool summers, high humidity, and consistently moist acidic conditions. This is one of the most challenging Phyllodoce species to grow at lower elevations due to its requirement for cool temperatures year-round. Toxicity to pets has not been confirmed by ASPCA; as an Ericaceae member, treat with caution.

Mature size: 10–25 cm tall and 30–50 cm wide.

Watch for — Root rot in wet or compacted soils: Winter waterlogging rapidly kills roots; ensure gritty, free-draining acidic soil and raise the planting area in heavy soils — alpine troughs with drainage holes filled with a grit-rich ericaceous mix are ideal for container culture.

How to tell yellow mountain heath needs repotting

Repotting on a calendar is less reliable than reading the plant. For yellow mountain heath, 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 yellow mountain heath

Every 2–3 years, into bone-dry mix. Yellow Mountain Heath's growth habit — low mat-forming evergreen subshrub with narrow, gland-tipped leaves densely arranged along the stems. — sets the pace. Phyllodoce glanduliflora is a low-growing evergreen subshrub native to alpine and subalpine zones of western North America from Oregon and Wyoming northward to Alaska, distinguished by its pale yellowish-white, glandular-hairy urn-shaped flowers in late spring and early summer. It naturally occurs above 1,500 m on moist, rocky or sandy slopes with peaty soils and requires cool summers, high humidity, and consistently moist acidic conditions. This is one of the most challenging Phyllodoce species to grow at lower elevations due to its requirement for cool temperatures year-round. Toxicity to pets has not been confirmed by ASPCA; as an Ericaceae member, treat with caution.

What size pot to step yellow mountain heath up to

Use a pot only one size up — or even the same pot with fresh gritty mix if the roots have room. Yellow Mountain Heath 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 yellow mountain heath

Spring or summer, while yellow mountain heath 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 yellow mountain heath

Repot dry. Do not water yellow mountain heath 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, acidic (ph 4.5–5.5), gritty and peaty, well-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 yellow mountain heath 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 yellow mountain heath 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 yellow mountain heath

Yellow Mountain Heath wants moist, acidic (ph 4.5–5.5), gritty and peaty, well-drained. Grows naturally in sandy or rocky soils with peat at high altitude; incorporate horticultural grit and ericaceous compost to replicate these conditions in cultivation, ensuring sharp drainage to prevent waterlogging in winter. Always use fresh mix when you repot — reusing old, broken-down soil reintroduces the compaction and poor drainage you are repotting to fix.

Repotting yellow mountain heath — frequently asked questions

How often should you repot yellow mountain heath?

Every 2–3 years, into bone-dry mix for yellow mountain heath. Repot yellow mountain heath every 2–3 years into a snug pot of moist, acidic (ph 4.5–5.5), gritty and peaty, well-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 yellow mountain heath need?

When is the best time of year to repot yellow mountain heath?

Should you water yellow mountain heath after repotting?

No — not straight away. Repot yellow mountain heath 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 yellow mountain heath after repotting?

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