Hypericum kalmianum 'Deppe' SUNNY BOULEVARD® Kalm's St. John's wort
size/type
medium-sized shrub,medium-sized shrub
usual height
0,8-1m
usual width
0,8-1m
leaves
deciduous broadleaf
colour of leaves
flowers
showy
colour of flowers
blooming time
July-September
location
full sun
soil type
any (acidic to alkaline)
soil moisture requirements
evenly moist but well-drained
USDA zone (lowest)
5 (down to -29°C)
winter protection
for zone 5+6
for zone 7
categorized
Hypericum
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 SUNNY BOULEVARD® is a variety from 2004, bred by Timothy D. Wood from Grand Haven in Michigan, USA, the same man behind LITTLE LIME® hydrangea and LEMONY LACE® elder. Granted patents: PP20045 (2009 – USA) and 33315 (2012 – Europe).Description of the plant:
SUNNY BOULEVARD® is a low, dense growing shrub with erect stems and rosemary-like green leaves. Each stem bears cymes of up to 7 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 a very successful variety Gemo SUNNY BOULEVARD® is more compact, denser in habit, and a little shorter in size.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 ideal for a rockery, too. It is absolutely pest-free and disease resistant. Fully hardy to about -29 °C (USDA zone 5) and suitable for year-round cultivation in outdoor pots with good drainage and without saucers.
Last update 24-04-2022
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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.
