Penstemon Lilac Frost

Sowing:

Sow from February to April. Penstemon 'Lilac Frost' seeds will usually germinate in 18-21 days, sometimes even longer. Usually, they require light to germinate. Plant the seeds at a depth of 1 mm (0in) in well-drained soil. Keep the sowing around 15°C (59°F), enclosed in a plastic bag—transplant the seedlings into pots when they are large enough to handle. Grow them in a cooler environment for 10 to 15 days before planting them out once all risk of frost has passed. Space the young plants 60 cm (24in) apart.

Cultivation:

To succeed in growing hybrid penstemons, the nature of the soil is crucial. They prefer rich, fresh to dry, but very well-drained soils, especially in winter. In excessively wet soils, they rot quickly. In cool climates, place the plants in a warm and sunny position, sheltered from cold winds (south or west exposure). In hot climates, choose a relatively cool and semi-shaded location. The hybrid penstemon 'Lilac Frost' is one of the most resistant. It can withstand temperatures as low as -20 °C (- 4°F), but in a well-drained soil. It is advisable to take stem cuttings in very cold regions in autumn. It does not suffer from specific diseases. This plant requires minimal maintenance, but when removing faded flowers in autumn, slightly shorten the flower stems without cutting them back to the ground, especially in regions where winters are humid. Indeed, the foliage plays a vital role in humidity regulation. Wait for spring to be well established (March-April) before pruning the branches whose foliage has been damaged by the cold. If summer is dry, water regularly to support flowering. Cover the base with glass or a cold frame in the coldest regions to protect it from severe cold. Divide your penstemons every three or four years to rejuvenate them, and wait for spring to carry out this operation.