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Marsh labrador tea

Rhododendron tomentosum · Ericaceae

The gardener's calendar

The right move for September

In autumn, ease off feeding and take the chance to clean up around marsh labrador tea and prepare for winter.

JFMAMJJASOND Planting

ID card

Foliage
Evergreen, dark green, highly aromatic
Flowering
Spring (April-May), white or pale pink flowers
Adult size
0.5 to 1.5 m in height, compact bushy habit
Growth
Slow to moderate
Hardiness
Very hardy, down to -30 °C
Origin
Subarctic and boreal regions of northern Europe and Asia
Soil
Acidic, well-drained, rich in organic matter
Plant type
Dwarf ornamental and aromatic shrub

Care

Watering

Keep the soil moist but never waterlogged, especially during the growing season. Water moderately in winter. This plant tolerates wet soils well in its natural climate but fears stagnant water. Prefer rainwater or demineralized water if your water is hard.

Light exposure

Place your ledum in full sun to partial shade for generous flowering. It tolerates partial shade well and benefits from protection against drying winds. In warm climates, light afternoon shade is welcome.

Soil and substrate

Require acidic soil (pH 4.5 to 6), well-drained and rich in organic matter. Enrich the potting mix with peat or heather soil. Absolutely avoid alkaline or neutral soils which cause nutritional deficiencies.

Pruning

Prune lightly after flowering to maintain a compact shape. Remove faded flowers and dead wood. No severe pruning is necessary; this species naturally remains bushy and dense.

Fertilizing

Apply fertilizer for heather plants in spring and summer. Avoid excess which can burn roots. A light application every 4 to 6 weeks is more than sufficient.

Diseases and pests

Generally very robust and rarely affected by diseases. Watch for powdery mildew in overly humid and stagnant atmospheres. Spider mites may appear indoors in dry conditions; increase ambient humidity to prevent.

Did you know?

Subarctic ledum is also called "marsh ledum" because it naturally thrives in northern peatlands. Its leaves are extremely aromatic and have been traditionally used in Scandinavian and Russian regions to flavor beverages or repel insects. Its powerful minty fragrance is so intense it would almost make the plant "energy-draining" given how readily it releases volatile essences at the slightest touch.

Where to buy it

Best planted in autumn so the roots settle in before summer, or in early spring once the frost has passed. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, October, November.

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Tips generated and checked by Viridia — adapt them to your local climate.