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Grindelia integrifolia

Grindelia integrifolia

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This plant carries a 12 months recovery warranty

More information

A perennial with golden yellow flowers and a darker centre.
Height at maturity
1.50 m
Spread at maturity
50 cm
Exposure
Sun
Hardiness
Hardy down to -23°C
Soil moisture
Dry soil
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Recommended planting time February to April, September to November
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Flowering time July to October
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Description

Grindelia integrifolia is a perennial American plant forming a robust and spectacular clump.

 

Its yellow flowers catch the light in a unique way. When the buds open, they are covered in an abundant and sticky nectar that forms a kind of varnish. When the flower is fully open, this "varnish" remains attached to the ligules and the thorny bracts beneath the flower, making this flowering shiny and silvery.

Similar to the previous species, but forming even larger clumps. The bluish-green leaves are larger, measuring 25 to 35cm (10 to 14in) long and 5 to 6cm (2in) wide. They are also more dentate. The flowers, measuring 6 to 7cm (2 to 3in) in diameter, have slightly wider and more spaced golden yellow petals. They also have a slightly darker centre, but still display the same brilliance.

Grindelia integrifolia in pictures

Grindelia integrifolia (Flowering) Flowering
Grindelia integrifolia (Foliage) Foliage

Flowering

Flower colour yellow
Flowering time July to October

Foliage

Foliage persistence Deciduous
Foliage colour medium green

Plant habit

Height at maturity 1.50 m
Spread at maturity 50 cm
Growth rate normal

Botanical data

Genus

Grindelia

Species

integrifolia

Family

Asteraceae

Origin

Cultivar or hybrid

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Planting and care

They are only truly hardy in a warm exposure with the driest possible soil in winter. We grow these rarely offered plants in the rich but porous, well-drained and dry soil of our scree garden, alongside galega, grasses, calamints, and various salvias.

Planting period

Recommended planting time February to April, September to November

Intended location

Suitable for Shaded rockery, Woodland edge, Undergrowth
Type of use Border
Hardiness Hardy down to -23°C (USDA zone 6a) Show map
Ease of cultivation Amateur
Planting density 5 per m2
Exposure Sun
Soil pH Neutral
Soil type Stony (poor and well-drained)
Soil moisture Dry soil, well-draining

Care

Pruning No pruning necessary
Overwinter Can be left in the ground

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