Didžioji jonažolė

PLANT NAME
Lithuanian plant name	Didžioji jonažolė
Latin plant name	Hypericum x inodorum Mill.
English plant name	St. John’s Wort
TYPE OF PARTERRE	Flowerbed, parterres Clump, beds (mixborder) Groups Wild plant parterre Solitaire Combination with woody plants
ASSORTMENT	supplementary
GROWING PLACE CHARACTERISTICS
Soil	average wet soils
Lighting	Heliophilous
Spacing, cm	From 40 to 50
PLANT HEIGHT AND HABITUS
Height	short – 21-40 cm middle height – 41- 60 cm tall - 61-80 cm very tall – 81 cm and over
Habitus	flower with expressive habitus, for design as accent
PLANTS ORNAMENTALITY
Leaf color	green
Blossom color	yellow, yellow tints
Blooming time	2-nd half of the summer - July Third Decade - August autumn - September - October
Blooming period	2 months
General ornamentality	decorative
Ornamentality duration, months	5
Group	logn-lived perennial (grown 7 and more years)
Bioecological group	Perennial
PLANT PROPAGATION
Propagation methods: seeds, cuttings. Propagation by scrub division is complicated and used rarely. Flower is propagated by scrub division in cold beds in Spring. Seeds are small. 3500 seeds per 1 gram. 1000 seedlings per 1 gram of seed sown. Seeds stay viable for 2 years. Seeds stay viable for 2 years. Seed viability percentages declined to 10-20% after a 3 year of storage Seeds germinate in 15-20 days. The flower is propagated by scrub division in cold beds in substrate of sand and peat (1:1) in the first part of Summer.