Blue Star Clematis Clematis 'Lasurstern' (EL)

Water

Clematis 'Lasurstern', commonly known as Large-flowered Clematis, should be watered deeply once a week, ensuring that the soil is thoroughly moistened. During the growing season, this can mean using about 1 gallon of water per plant for each watering session. The water should be applied directly to the base of the plant to avoid wetting the foliage, which can lead to fungal diseases. In hot, dry periods, water may need to be applied twice a week. During the winter or dormant period, reduce watering frequency to when the top inch of soil feels dry to the touch.

Light

Large-flowered Clematis prefers a location where it can receive at least six hours of sunlight daily. It thrives best in a spot that offers morning sun and dappled or partial shade in the afternoon, as intense afternoon sun can sometimes be too harsh for the plant. This clematis variety also does well with its roots in the shade and its vines in the sun, which can be achieved by planting low-growing shrubs or perennials around the base.

Temperature

The ideal temperature for Large-flowered Clematis is between 55°F and 70°F. It can survive minimum temperatures down to about 20°F, and maximum temperatures up to around 85°F, though extreme temperatures may stress the plant. It's important to provide a location that remains relatively consistent in temperature, avoiding areas that experience drastic temperature swings.

Pruning

Pruning of Large-flowered Clematis encourages strong growth and flowering. Prune in late winter or early spring before active growth begins, removing dead or weak stems and cutting the remaining stems back to a strong pair of buds. This typically involves cutting the plant down to about 12 inches from the ground. The best time for pruning Group 2 clematis like 'Lasurstern' is right after the first flowering to shape the plant and promote a second flush of blooms.

Cleaning

As needed

Soil

Clematis 'Lasurstern', also known as Large-flowered Clematis, thrives in well-draining, moisture-retentive soil with a pH range of 6.0 to 7.0. A mix containing loam, compost, and well-rotted manure is beneficial, providing both fertility and good drainage. Mulching can help keep the root zone cool and moist.

Repotting

Large-flowered Clematis should be repotted every 2-3 years, or when it becomes root-bound. Early spring, before the growing season begins, is the best time to repot this plant to minimize stress and allow for vigorous growth.

Humidity & Misting

Large-flowered Clematis prefers moderate humidity levels but is quite adaptable to varying conditions outside. Outdoor plants generally receive sufficient humidity from the natural environment, without requiring adjustments.

Suitable locations

• Indoor

  Ensure bright indirect light and support for climbing.

• Outdoor

  Plant in sun to partial shade; provide a trellis.

• Hardiness zone

  4-9 USDA

Life cycle

The Clematis 'Lasurstern', commonly known as clematis, begins its life as a seed that germinates in suitable conditions of soil warmth and moisture. After germination, the seedling emerges and develops a root system and shoots, entering the vegetative stage where it focuses on producing leaves and stems. As it matures, the clematis enters the flowering stage, typically in late spring or early summer, where it produces large, star-shaped, often blue or violet flowers that attract pollinators. Following pollination, the plant may produce fruits with seeds, entering the reproductive stage where these seeds can be dispersed to give rise to new plants. The clematis then goes through a period of dormancy, usually in winter, where above-ground growth slows down or dies back, while the root system remains alive. With the return of warmer temperatures in spring, the clematis resumes growth from the root stock or surviving stems, completing its annual life cycle.

Propogation

• Propogation time

  Spring to early summer

• Clematis 'Lasurstern', often known as the clematis, can be propagated through several methods, but the most popular and effective means of propagation is by stem cuttings. This is usually done in spring or early summer when the plant is actively growing. To propagate from cuttings, a gardener would take a healthy stem of about 4 to 6 inches long, ensuring there are at least two sets of leaves. The bottom set of leaves is removed, and the cut end is dipped in rooting hormone before being planted in a well-draining soil mix. The cutting should then be placed in indirect light and kept consistently moist until roots develop, which typically takes a few weeks to a month. Once the roots are established, the new clematis plant can be transplanted to a more permanent location outdoors.