Hardy blue-flowered leadwort Ceratostigma plumbaginoides

Water

The Leadwort, officially known as Ceratostigma plumbaginoides, prefers consistent moisture, especially during the growing season. It's best to water this plant deeply once or twice a week, depending on the weather conditions—more frequently during hot, dry periods, and less during cooler, rainy spells. Aim to provide about an inch of water each time, which translates to roughly 0.6 gallons for a typical small garden plant. It's important to avoid overwatering; ensure the soil is well-drained to prevent root rot. During winter, when the plant is dormant, reduce watering significantly, only making sure the soil doesn't completely dry out.

Light

For the Leadwort, proper light conditions are essential for vibrant blooms and healthy growth. This plant thrives in full sun to partial shade. An ideal spot would receive morning sunlight and some afternoon shade, especially in hotter climates, or full sun in cooler regions. Too much shade can reduce flowering and cause the plant to become leggy, so aim for a balance that gives the Leadwort enough light without exposing it to harsh midday sun in peak summer.

Temperature

Leadwort can tolerate a range of temperatures, thriving between 60 to 75 degrees Fahrenheit. They are quite cold hardy and can withstand temperatures down to about 10 degrees Fahrenheit, making them suitable for many gardening zones. However, they should be protected from extreme heat and frost, as temperatures consistently above 85 degrees Fahrenheit or sudden frosts can be damaging. Moderation is key to a happy Leadwort.

Pruning

Pruning the Leadwort is crucial for maintaining plant vigor and encouraging a compact growth habit. It's best pruned in late winter or early spring before new growth begins, to remove any dead or damaged wood and to shape the plant. Additionally, deadheading spent flowers can promote further blooming. Pruning can be done annually, to keep the plant tidy and within desired dimensions.

Cleaning

As needed

Soil

Plumbago requires a well-drained, loamy soil with a pH ranging between 5.5 and 7.5. A mix containing equal parts of garden soil, peat or compost, and coarse sand or perlite is ideal to ensure good drainage and fertility.

Repotting

Plumbago should be repotted every 2-3 years to refresh the soil and prevent the plant from becoming root-bound; repotting is less frequent once mature.

Humidity & Misting

Plumbago thrives in average humidity levels; it does not require any special humidity conditions to grow well.

Suitable locations

• Indoor

  Ensure bright light, well-draining soil and keep temps above 50°F.

• Outdoor

  Place in full sun to part shade and in well-draining soil.

• Hardiness zone

  5-9 USDA

Life cycle

Ceratostigma plumbaginoides, commonly known as plumbago or leadwort, begins its life cycle as a seed, entering a period of dormancy until conditions are favorable for germination, typically in the spring. Upon germination, the plant develops a root system and foliar growth, establishing itself as a young plant. In the vegetative stage, plumbago rapidly spreads through rhizomes and produces lush greenery. As it enters the flowering stage in late summer to fall, plumbago produces vivid blue to purplish flowers that attract pollinators, leading to the production of seeds. After flowering, as temperatures drop in the fall, the leaves often take on a beautiful reddish tint before the plant enters into dormancy during the winter months, losing its leaves in colder climates. With the return of warmer weather, the cycle begins anew with the regrowth of this hardy perennial from its overwintering roots.

Propogation

• Propogation time

  Summer to fall

• Propogation: The Plumbago or Leadwort (Ceratostigma plumbaginoides) is commonly propagated by stem cuttings. This method is particularly effective when performed in late spring to early summer, as the semi-hardwood cuttings from new growth have the highest chance of rooting successfully. To propagate by cuttings, a 4 to 6 inch (10 to 15 cm) portion of a healthy stem is cut just below a leaf node, and the lower leaves are removed. The cut end is often treated with rooting hormone to encourage root development and then planted in a well-draining soil mix. The cutting is kept moist and in a warm place with indirect light until roots have formed, which typically takes a few weeks. Once rooted, the cutting can be transplanted into a more permanent location.