Phlox - Phlox

Phlox - Phlox


Genus of 66 species of herbaceous and suffruttic plants, annual and perennial, semi-rustic and rustic. Of very variable dimensions, there are dwarf species that do not exceed 10 cm and others that reach one and a half meters. Flox plants originate from North America but have also spread to our territory. The flowers of the Phlox varieties have the particularity of being brightly colored depending on the variety. By alternating the sowing times of the Phlox plants, flowers can be obtained all year round.


The ideal soil for Phlox is moist, well drained and very fertile, with variations in the quantity of peat in relation to the species. It is advisable to fertilize perennial species in April, with mature manure.


occurs by seed in the annual species, and by cutting for the perennial species. For the cuttings, 8-10 cm branches are cut in March; the cuttings will be potted when they are well rooted and planted only in the following spring. Root cuttings can be used when the plant is attacked by stem nematodes, using a planting compound and keeping the cuttings at 15 degrees until they release new shoots.


As for the water needs of the Phlox it is good that watering is regular and abundant during the hot season, especially in periods of drought; decrease watering during the other seasons.

Phlox is a rather rustic plant and is well suited to both growing in the sun and in shady areas. The perennial species tolerate the winter cold well, the annual species, which are sown in September to obtain an early flowering, will be kept in the greenhouse at 8-10 ° throughout the winter.

Parasites and diseases

nematodes cause deformation of leaves and branches. The only remedy is the elimination of diseased plants. Powdery mildew attacks leaves, especially in varieties grown in greenhouses. It is therefore advisable to provide preventive treatments with specific products that protect Phlox specimens from attack by parasites and diseases.


The tall herbaceous species, annual and perennial, are suitable for mixed borders and for the production of cut flowers;

P. drummondii, perennial but cultivated as an annual, is used in flowerbeds or, in greenhouses, as a spring flowering pot plant, perennial dwarf plants, generally evergreen, are suitable for rock gardens and dry stone walls.

Among these species we remember: P. douglasii

Among the annual species P. Drummondii;

Among the perennial border species P. Maculata.

Cultivation techniques for annual species

they are grown in all well-drained garden soils. The seedlings are planted in May, in a sunny position. If the withered buds are cut off, the flowering period becomes longer. In poor soils it is good to periodically administer a liquid fertilizer. To obtain flowering in spring under glass, the seedlings sown in September are potted in 8 cm containers, filled with compost, and subsequently transplanted into 12 cm containers and wintered in the greenhouse. at a temperature of 8-10 ° C. Flowering generally begins in March.

Phlox - Phlox: Cultivation technique for perennial border species

They are planted in October or February-March in a sunny or partially shaded position, in fertile, humid and well-drained soil.

Every year, in April, mulch is done with mature manure or compost to keep the soil moist. During dry periods it is watered abundantly, otherwise the plants wither and produce few flowers. Older plants produce numerous weaker branches that need to be cut in spring. In October the dry flower stems are cut just above the ground level, generally these plants need support.