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Blue-stemmed goldenrod

Solidago caesia · Asteraceae

The gardener's calendar

The right move for September

Ideal time to plant blue-stemmed goldenrod: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.

JFMAMJJASOND Planting

ID card

Common name
Bluish goldenrod
Family
Asteraceae
Type
Perennial herb
Flowering
August to October
Adult size
24 to 35 inches tall
Foliage
Deciduous
Hardiness
Very hardy (down to -4°F)
Origin
North America

Care

Light exposure

Plant your bluish goldenrod in full sun or partial shade, ideally in a bright location. This species appreciates sunny exposure for generous flowering, but tolerates lightly shaded areas well. However, avoid prolonged deep shade.

Watering

Water regularly during growth and especially in the first year, keeping the soil moist but without waterlogging. Once established, this plant is undemanding and tolerates dry periods well. Reduce watering in winter.

Soil

This goldenrod prefers well-drained soil, preferably slightly acidic to neutral. It tolerates various soil types, including poor soil, and isn't bothered by salt spray. Improve heavy soil with compost or coarse sand.

Fertilizer

A spring application of well-decomposed compost is usually sufficient. Avoid excess nitrogen, which would encourage foliage at the expense of flowering. Goldenrods are undemanding and thrive in moderately rich soils.

Pruning and cleanup

Cut stems back to ground level in late winter or early spring. You can also pinch young shoots in May to encourage a more compact, floriferous habit. Remove spent flowers to encourage new inflorescence production.

Diseases and pests

This species is generally resistant to common diseases. In very humid conditions, watch for powdery mildew or rot. Spider mites may occasionally affect it during prolonged drought. Space plants well and ensure good air circulation.

Did you know?

The bluish goldenrod bears its epithet 'caesia' because its yellow inflorescences often appear tinged with a characteristic blue hue, giving it botanical charm. Long wrongly blamed for causing allergies (the real culprit being ragweed or ambrosia, which flowers at the same time), this plant is actually an excellent choice for gardeners allergic to pollen, as it's pollinated by insects.

Where to buy it

Plant in spring or early autumn, avoiding spells of intense heat. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, April, May, September.

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