If you want a shrub that bursts with mid- to late spring color and thrills butterflies and bees, you can grow Caryopteris (C. x clandonensis). Also called bluebeard, blue mist, and blue mist spirea, caryopteris plants actually are part of the mint (Laminaceae) family, a recent change from their former placement in the verbena family. Regardless, they are nothing like a spirea, but the name has stuck.
Caryopteris is a drought-tolerant shrub that has pretty, sage-like pale green leaves. The leaves have a nice, light scent. They drop in winter (it is deciduous) but begin emerging in late spring or early summer. I leave the brown seed heads on for some winter interest; blue mist still will maintain its shrub shape with dry, light brown stems.
The plant comes from Asia, so it is not native to North America. That does not seem to bother my pollinators and I have not seen the plant spread invasively, unlike its mint relatives. Still, you can prevent it from self-sowing (dropping seeds to create new plants) by pruning it in fall as soon as all the flowers fade.
Where to Plant Caryopteris
This pretty and easy-care shrub can grow and bloom in either full sun or part sun in zone 5 through 8 Southwest gardens. Some cultivars are hardy down to zone 4. The plant can reach 3 feet wide and 4 feet high, but can grow a little taller in the right conditions. It is easy to shape and control. Blue mist can make a nice low hedge if planted close together or serve as a featured plant in a sunny area.
Blue mist does not like to sit in soggy soil, especially in cooler weather, so choose a spot with soil that drains well. We had one near our house that seemed to be getting too much water from patio runoff. When we built a dry river bed to handle drainage, we created a low berm for the caryopteris. It still gathers water from the flowing rain runoff but does not stay too wet.
Caring for Caryopteris
In the first year, water caryopteris regularly, letting it dry a little between waterings. When temperatures stay above about 90 degrees, water blue mist every two weeks if you are not getting rain. To avoid root rot, cut back on watering when nights cool and for plants getting some shade.
Other than that, all you have to do is prune this stunning purple plant once a year. I prune mine in spring as new growth begins to appear near the ground, but you can prune in early fall after the plant fades if you are worried about self-sowing. You can trim the branches down to about 12 to 15 inches from the ground for a pretty shrub effect. We also had some planted together in one area of the garden that my husband shaped so they would frame the nearby Apache plume.
If you do get volunteer plants or your caryopteris outgrows its spot in your garden, it is an easy shrub to transplant. Carefully dig deeply around your small volunteers soon after their lower leaves green up in spring. We also divided the one we put back on the berm, and both plants have retained a nice round shape.
It’s drought tolerant, a pollinator magnet and easy care. You can grow caryopteris!