Lythrum hyssopifolia
Lythrum hyssopifolia · Lythraceae
The gardener's calendar
Ideal time to plant lythrum hyssopifolia: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.
ID card
- Foliage
- Deciduous
- Flowering
- June to September, pink-purple flowers
- Adult size
- 20 to 60 cm in height
- Growth
- Fast
- Hardiness
- Hardy, tolerates down to -15°C
- Origin
- Mediterranean and temperate regions of Europe
- Soil type
- Moist to waterlogged, undemanding
Care
Watering
Hyssop-leaved loosestrife loves moist environments and appreciates regularly wet soil. Keep the substrate fresh, especially during warm periods. In containers, water generously but avoid root suffocation by ensuring good drainage.
Light exposure
Plant this species in full sun or partial shade for optimal flowering. It tolerates partial shade well but will flower less abundantly. Sunny exposure (6 to 8 hours per day) promotes vigorous growth and better flower production.
Soil
Prefer a substrate rich in organic matter, fresh and well-drained despite its love of moisture. Adding compost or peat improves structure. This plant adapts to slightly acidic to neutral soils and even tolerates poor soils.
Fertilizer
A balanced fertilizer application in spring is generally sufficient. To promote long flowering, administer a lightly dosed fertilizer each month from May to August. Avoid excess nitrogen which could promote foliage at the expense of flowers.
Pruning and cutting
Cut back dried stems in spring to stimulate branching. After flowering, light pruning maintains a compact shape and encourages secondary flowers. This plant doesn't require strict pruning but benefits from it to remain dense.
Diseases and pests
Loosestrife is generally robust and not very susceptible to pests. In overly humid and poorly ventilated conditions, watch out for root rot and powdery mildew. Ensure good air circulation and avoid stagnant moisture to prevent these problems.
Did you know?
Hyssop-leaved loosestrife has historically been used in traditional herbal medicine for its astringent properties, particularly to treat mild digestive disorders. Its Greek name 'lythrum' means 'blood', alluding to the intense color of its flowers which also inspired botanical dyes. This small perennial has gradually colonized many wetland areas across Europe where it has naturalized, becoming an appreciated component of riverside ecosystems.
Where to buy it
Plant in spring or early autumn, avoiding spells of intense heat. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, April, May, September.
Add this plant to my garden →Plants from the same family
- PomegranatePunica granatum
- Crape-myrtleLagerstroemia indica
- False heatherCuphea hyssopifolia
- Purple loosestrifeLythrum salicaria
- Pourpier deauLythrum portula
- Colombian waxweedCuphea carthagenensis
Tips generated and checked by Viridia — adapt them to your local climate.