- Species and varieties: Trachelium caeruleum, commonly known as Blue Throatwort or Blue Lace Flower, belongs to the Campanulaceae family. It is a perennial plant that is often grown as an annual in cooler climates. Varieties include 'Devotion Blue', 'White Lake', and 'Purple Lake'.
- Hybrid or heirloom: Trachelium caeruleum seeds are typically heirloom varieties, known for their traditional cultivation and preservation over generations. However, some hybrid varieties may also be available, offering improved traits such as disease resistance and uniformity.
- Pruning and training: Regular deadheading of spent flowers encourages continuous blooming. In perennial growth, cutting back the plant in late winter or early spring promotes healthy new growth. No special training is required, but staking may be necessary in windy areas to support the tall flower stems.
- Fertilization needs: Trachelium caeruleum benefits from a balanced, slow-release fertilizer applied in early spring. During the growing season, a monthly application of a liquid fertilizer can promote vigorous growth and abundant flowering. Avoid over-fertilizing, as this can lead to excessive foliage growth at the expense of flowers.
- Hardiness zones: Trachelium caeruleum is suitable for USDA hardiness zones 7-10. In these zones, it can be grown as a perennial. In cooler zones, it is often grown as an annual.
- Climate requirements: This plant prefers a Mediterranean climate with mild, wet winters and hot, dry summers. It thrives in full sun to partial shade and requires well-drained soil. It is moderately drought-tolerant once established but benefits from regular watering during dry periods.