A dense, bushy shrub native to California, Carpenteria californica carries a prolific blooming that opens in spring and lasts into the beginning of summer. Give it full sun, rather rich, well-drained soil and a spot sheltered from wind, and it will flower at its most generous — and shrug off cold to about 9°F.
Carpenteria californica at a glance
Name
Carpenteria californica
Family
Hydrangeaceae
Type
flower shrub
Height
3 to 6 ½ feet (1 to 2 meters)
Exposure
full sun
Soil
ordinary
Foliage
evergreen
Flowering
summer
Only the most up-to-date are aware of this plant, so here are the tips on how to grow Carpenteria californica.
Planting carpenteria californica
For the planting of carpenteria californica, it is preferable to proceed in spring in case your region has harsh winters.
In other, milder regions, plant in fall to favor root development and renewed growth in spring.
You can also plant carpenteria californica in pots outside of this period as long as you avoid both freezing temperatures and heat waves.
Carpenteria californica loves full sun.
It fares best in wind-sheltered spots which protect its blooming.
It likes rather rich and well drained soil, that is where it flowers best.
Adding soil conditioner such as manure and seaweed or fertilizer when planting enhances settling in and root development.
Water well during the first 2 years after planting.
Carpenteria californica: what to do and when
Planting, propagation, pruning and feeding each have their own moment in the year. Here is the whole cycle at a glance, so you can see where you are before reading the detail.
Carpenteria californica: what to do and when
Task
When
Key point
Planting in cold regions
Early to mid-spring
Safer where winters are harsh
Planting in mild regions
Autumn
Favours root development and renewed growth in spring
Taking cuttings
Late summer
Wood starting to harden, no longer green nor yet brown
Potting cuttings on
Mid- to late spring
Once the last frosts are past, into pots one size larger
Pruning
Early summer, after flowering
Shorten the sprigs of the year by about a third
Feeding potted plants
Late winter
Flower shrub fertilizer to boost the blooming
Meet those few dates and the shrub asks for very little else.
Propagating Carpenteria californica
Carpenteria californica is easily multiplied by preparing cuttings from its sprigs in August, it is the simplest propagation method.
Cuttings from carpenteria californica are prepared in summer, when the wood is starting to harden, i.e., it isn’t quite green anymore but isn’t also yet brown.
Collect stems from the carpenteria californica that are about 6 to 8 inches (15 to 20 cm) long.
Remove the lower leaves so that only the topmost one or two pairs of leaves are left.
Plant the cuttings in special cutting soil mix or a blend of peat and river sand.
Maintain the moisture of the soil mix while ensuring that it isn’t drowning.
Protect your cuttings before winter
Protect your carpenteria californica cuttings with a tunnel greenhouse, a greenhouse or any other solution that is able to keep them at a temperature of 40°F (5°C).
Transplant in spring
When the last frosts are past, towards mid-May, transplant in nursery pots one size larger.
Planting your carpenteria californica cuttings in the ground will take place in the following fall.
Once it feels at home, Carpenteria californica only requires very little care and the attention you must give it is reduced to the least. Notwithstanding this, you can of course prune it and water it to increase the flowering and growth.
Pruning carpenteria californica
Pruning carpenteria californica is best performed after the blooming.
Prune the sprigs of the year, by more or less ⅓, when the flowers have died off.
A pruned carpenteria californica will be more dense and will thus have a more abundant blooming.
Watering carpenteria californica and addition of fertilizer
Regular watering during the year of planting is recommended to speed root development up.
In summer, in case of heat wave or dry spell, you can water in the morning or in the evening.
Carpenteria californica hates waterlogged soil.
Specific needs of potted Carpenteria californica
For potted Carpenteria californica, watering is called for as soon as the soil turns dry, because needs are higher than in full earth.
At the end of winter, adding flower shrub fertilizer will significantly increase the blooming.
In time, needs will increase as the plant develops, so you’ll have to renew this amendment 2 to 3 times during the year.
Learn more about carpenteria californica
Native to California, as its name shows, Carpenteria californica has a very bushy growth and a very beautiful blooming in spring which will last until the beginning of summer.
The first specimen was discovered in 1849 in the Sierra Nevada by the botanist Fremont, who named the plant in honor of William Carpenter, a notorious British botanist.
Bushy growth makes a very ornamental garden shrub
This shrub is very ornamental and just as hardy down to about 9°F (-13°C), which makes it a very manageable shrub that is within reach of any gardener.
A unique and very prolific flower bearer, Carpenteria californica could quickly become one of the most remarkable shrubs in your garden or terrace.
Written by Gaspard Lorthiois | Loves helping out, especially when it comes to growing things. Worked in herbal medicine, runs a farm, and dabbles in tech. Master's degree and engineer.
