Hypericum kalmianum var. LATIFOLIA Kalm's St. John's Wort
size/type
medium-sized shrub,small shrub
usual height
0,8-1,3m
usual width
0,8-1,5m
leaves
deciduous broadleaf
colour of leaves
flowers
showy
colour of flowers
blooming time
July-August
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
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.
Description of the plant:
Latifolia is a St. John’s wort selection with broader and larger leaves. They are deciduous, narrowly lance-shaped, rich green, and completely cover the plant before the flowers open. Those are small, 3-4 cm across, saucer-shaped, golden yellow with a profusion of stamens in the centre. Blooming begins in July and continues until early autumn which makes it one of the most attractive and longest flowering shrubs of late summer. Kalm’s St. John’s wort makes a dense, rather low, rounded shrub. To keep it compact and bushy prune it in early spring – remove last year’s growths by a 50-80%. Grow these smaller woody hypericums in full sun, moderately fertile soil that is very well drained. It is absolutely pest-free and disease resistant. Fully hardy to min. -30 °C (USDA zone 5) and suitable for year-round cultivation in outdoor pots with good drainage and without saucers.
Last update 26-10-2022
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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.
