Ceanothus trewithen blue is an evergreen shrub that is native to California. It grows in the Santa Lucia Mountains of Monterey County. The plant was named after Trewithen Gardens in Cornwall, England. The plant is characterized by its small, blue flowers and glossy, dark green leaves. It prefers full sun to partial shade and well-drained soil.
Related plant:
Ceanothus Arboreus
Related plant:
Ceanothus Italian Skies
About soil condition, The best time to plant is in the early spring or late fall. Ceanothus trewithen blue prefers full sun to partial sun and well-drained soil. This plant is not drought tolerant. If you live in an area that has a lot of rainfall, this is the perfect plant for you. It can tolerate short periods of drought.
Not too different with other ceanothus shrubs, Trewithen Blue prefers a sunny location. It is quite drought tolerant once established, but looks best with regular watering during the first few years. It can be pruned quite hard in late winter if necessary.
The temperature condition that is most conducive to the growth of the Trewithen Blue ceanothus is between 68 and 77 degrees Fahrenheit. outside of this temperature range, the plant will still grow, but it will be slower and the leaves may begin to drop.
Ideal humidity condition for this plant is 50-70%. The plant cannot tolerate high humidity or wet conditions. If the humidity is too high, the leaves will develop fungal diseases. If the humidity is too low, the leaves will become dry and brown.
About fertilizer, this type of plant doesn't require much. A little bit of organic matter in the spring is all that is necessary. When it comes to the roots, they are very shallow so be careful not to plant it too deep. The rule of thumb is to plant it at the same depth that it was in the pot.
Pruning is an important part of keeping your ceanothus trewithen blue looking its best. Pruning will help to control the plant's size, shape, and encourage new growth. When pruning, be sure to remove any dead or dying branches, as well as any branches that are crossing or rubbing against each other. You should also prune away any suckers that are growing from the base of the plant.
Propagation is best performed in late spring or early summer. Take cuttings from new growth that is slightly woody at the base. The cuttings should be about 6 inches (15 cm) long and contain several sets of leaves. Strip off the lower leaves and dip the cut end in rooting hormone. Plant the cuttings in a well-drained potting mix and water well. Place the pot in a bright, warm location but out of direct sunlight. Keep the soil moist but not soggy. The cuttings should root in 4-8 weeks. Once the cuttings are rooted, transplant them into individual pots filled with a well-drained potting mix. Ceanothus trewithen blue can also be propagated from seed. Sow the seeds in a well-drained potting mix in late winter or early spring. Keep the soil moist but not soggy and place the pot in a bright, warm location but out of direct sunlight. The seeds should germinate in 4-8 weeks. Once the seedlings are large enough to handle, transplant them into individual pots filled with a well-drained potting mix.
Usually, the plant growth rate is about one to two feet per year. However, some plants can grow up to three feet per year. The growth rate of a blue trewithen ceanothus depends on the amount of sunlight and water it receives. If the plant receives too much water, it will grow more slowly. If the plant does not receive enough sunlight, it will not grow as quickly as it could.
Common problems for this kind of plant are mainly due to its aggressive root system. This can result in damages to pathways, patios, and other hardscape features. Additionally, the plant may crowd out other plants in the garden bed.
Source:
Managing Pests in Gardens: Trees and Shrubs: CeanothusUC IPM - ucanr.edu
Blue Blossom - Ceanothus thyrsiflorus - PNW Plants
Ceanothus - Wikipedia - wiki.alquds.edu
