Hypericum kalmianum 'Smhkbf' COBALT-N-GOLD (Blues Festival®)

Hypericum kalmianum 'Smhkbf'
Hypericum kalmianum 'Smhkbf' COBALT-N-GOLD (Blues Festival®)
St. John's Wort
SIZE/TYPE small shrub
 medium-sized shrub
USUAL HEIGHT 0.6-0.8m
USUAL WIDTH 0.8-1.3m
LEAVES deciduous broadleaf
COLOUR OF LEAVES +multicoloured:blue-green and green
FLOWERS showy
COLOUR OF FLOWERS yellow
BLOOMING TIME July - September
LOCATION full to partial sun
SOIL TYPE any (acidic to alkaline)
SOIL MOISTURE REQUIREMENTS evenly moist but well-drained
USDA zone (lowest) 4   (down to -34°C)
WINTER PROTECTION  
FOR ZONE 5+6 Code of winter protection zone 5+6
FOR ZONE 7 Code of winter protection zone 7
BELONGS TO CATEGORIES Deciduous broadleaf
Summer blooms
náhled fotonáhled fotonáhled foto
St. John’s Wort is a well know perennial from our meadows and fields. However, there are also a few woody species popular for their shrubby habit and extended flowering period in summer. Kalm’s St. John’s wort is one of them and COBALT-N-GOLD is a variety from 2009, bred by Timothy D. Wood from Grand Haven in Michigan, USA, the same man behind the previous variety SUNNY BOULEVARD®. It was granted a US patent No. 25795 in 2015.

COBALT-N-GOLD is a low, dense growing variety of St. John’s Wort with erect stems and rosemary-like leaves. Each stem bears cymes composed of saucer-shaped, 3-4 cm across, golden yellow flowers with profusion of stamens in the centre. Its starts blooming in July and continues until early autumn which makes it one of the most attractive and longest flowering shrubs of late summer. Compared to SUNNY BOULEVARD® this variety bears glaucous foliage which is still narrow, yet a little a wider.

COBALT-N-GOLD makes compact, densely branched, mounding shrubs perfect for informal hedges along pathways or companion plants for multi-stemmed, taller growing shrubs as an understory. It can take a little bit of shade but performs best in full sun.

Prune it in early spring – cut last year’s growths by 30-80% - the harder you prune the better-looking shrub you gain. Grow these smaller hypericums in full sun, moderately fertile soil that is very well drained. It is absolutely pest-free and disease resistant. Fully hardy to about -34 °C (USDA zone 4) and suitable for year-round cultivation in outdoor pots with good drainage and without saucers.

Last update 02-10-2022
SIZES and PRICES
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Hypericum kalmianum 'Smhkbf' COBALT-N-GOLD (Blues Festival®)
STANDARD
CHLUMEC BY POST
Hypericum kalmianum 'Smhkbf' COBALT-N-GOLD (Blues Festival®)
De Luxe
CHLUMEC BY POST
Hypericum kalmianum 'Smhkbf' COBALT-N-GOLD (Blues Festival®)
De Luxe
WINTER STORAGE BY POST

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Hypericum kalmianum
Hypericum kalmianum
GLOSSARY
  • STANDARD QUALITY - Plants of this group are 1st class quality with number of branches and overall density adequate to their size and age, considering they were container grown.
  • DE LUXE QUALITY - This label guarantees a luxurious quality of manually selected plants that, compared to their height and age, are exceptionally dense and beautiful.
  • EXTRA - These plants are usually mature and bigger specimens with exceptional overall appearance.
  • STANDARD (as described in the plant form) means a tree with a trunk of 190-210 cm and a crown at the top, unless specified differently. The commercial size for trees is their girth measured in the height of 1m from ground.
  • HOBBY - These plants are of the same quality as our standard-quality plants but younger and therefore cheaper.
  • SHRUB - a woody plant with branches growing bushy from the ground level.
  • HALF-STANDARD or MINI-STANDARD - a small tree with shorter trunk, its size is usually specified.
  • FEATHERED - These are trees with branches growing already from the base of the trunk and up along the stem.
  • GRASSES and PERENNIALS - Sizes given usually read the diameter of the pot or the clump, as specified.
LARGE PLANTS over 150 cmspecimens, screening and hedging shrubs

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