Creeping blue blossom Ceanothus thyrsiflorus var. repens

Water

The California Lilac (Ceanothus thyrsiflorus var. repens) prefers dry conditions once established and requires minimal watering. During the first growing season, water the plant deeply once a week, allowing the soil to dry between watering sessions. After establishment, reduce the frequency to once every two to four weeks, depending on weather conditions, providing about 1-2 gallons of water to maintain slight soil moisture. Overwatering can lead to root rot, so ensure good drainage.

Light

The California Lilac thrives best in full sunlight to partial shade. Ideally, find a spot where the plant can receive at least six hours of direct sunlight daily, which will encourage profuse blooming and healthy growth. Too much shade may hinder flower production and lead to a leggy plant.

Temperature

The California Lilac is hardy and can tolerate a range of temperatures once established. It can survive minimum temperatures down to around 10 degrees Fahrenheit but performs best in areas with moderate to warm temperatures. The ideal temperature range for this plant is between 50 to 75 degrees Fahrenheit to ensure healthy growth and flowering.

Pruning

Pruning the California Lilac is mainly for shaping and removing dead or damaged wood. It should be pruned immediately after flowering to avoid cutting off next year's buds. Pruning can be done annually, and it is best to lightly trim rather than cut back hard, as the plant may not recover well from severe pruning. The best time for pruning is in late spring or early summer, after the bloom period.

Cleaning

Not needed

Soil

The California Lilac, commonly referred to as Ceanothus thyrsiflorus var. repens, thrives best in well-draining soil with a slightly acidic to neutral pH of 5.5 to 7.0. A soil mix for this plant can be made by combining 2 parts garden soil, 1 part sand, and 1 part compost. This provides adequate drainage and a fertile environment, catering to the plant’s needs.

Repotting

California Lilac does not typically require frequent repotting; if necessary, repot every 2 to 3 years. Over time, its woody root system can become pot-bound, at which point it can be repotted to refresh the soil and provide more room for growth.

Humidity & Misting

California Lilac is adapted to a typical outdoor climate and does not require specific humidity conditions. It will generally do well in the average ambient humidity present in most Mediterranean and similar dry summer, wet winter climates.

Suitable locations

• Indoor

  Provide bright light, infrequent water, and good air circulation.

• Outdoor

  Full sun, well-draining soil, protect from severe frost.

• Hardiness zone

  8-10 USDA

Life cycle

Ceanothus thyrsiflorus var. repens, commonly known as California lilac, begins its life cycle as a seed, which typically requires exposure to fire or chemical cues for germination, a process called scarification. Once germinated, the seedling emerges and establishes a root system, transitioning into the vegetative stage where it grows leaves and stems. This shrub may enter a period of rapid growth during the spring, especially after rainfall. As it reaches maturity, the California lilac develops vibrant blue flowers in late winter to early spring, attracting pollinators such as bees and butterflies. After pollination, the plant produces fruit in the form of small, hard capsules that release seeds when they dry out and crack open. As a perennial, the California lilac can then enter a period of dormancy in response to environmental triggers like drought or cold temperatures, only to begin a new growth cycle with the next favorable season.

Propogation

• Propogation time

  Spring to early summer

• The California lilac (Ceanothus thyrsiflorus var. repens) is commonly propagated through semi-hardwood cuttings. This method is generally performed in late summer. To propagate, select a healthy, non-flowering stem and cut a piece about 4-6 inches (10-15 centimeters) long, making sure it includes at least two sets of leaves. Remove the leaves from the lower half of the cutting and dip the cut end in rooting hormone. Then, plant the cutting in a pot filled with a well-draining potting mix. Keep the soil moist and the cutting in a warm location with indirect light. Roots usually develop within a few weeks, and once established, the cutting can be transplanted outdoors.