Train Catalina ironwood to one trunk or keep several, and cut suckers as they appear. Early cuts shape the tree; older plants need less.
Train one trunk or keep several, and cut suckers as they appear
| Factor | Recommended | Avoid |
|---|---|---|
| When | Winter for structure, or after bloom if you are only cleaning | Do not wait years to take competing leaders |
| Form | One central trunk, or a few well-spaced trunks for a grove look | Do not let every basal sprout become a new leader unless you want a thicket |
| Suckers | Cut or rub them while they are small | Do not ignore a ring of shoots at the base if you want a single trunk |
| Hard cut | A rare cut to the basal burl can restart a ruined tree | Do not coppice it to the ground every year |
Catalina ironwood often sends shoots from the base. Those suckers will turn a clean trunk into a multi-stem thicket if you leave them. Decide early whether you want one trunk or several, then cut what you do not want while the wood is still small. [1] [2] Winter is a good window for structure. After bloom is fine if you are only cleaning. [3]
- Choose one straight leader, or two or three well-spaced trunks if you want a grove form.
- Cut competing leaders back to the trunk with a clean cut at the collar.
- Remove basal suckers as they appear if you want the single-trunk form to hold. [4]
- Do not cut a healthy tree to the ground as a yearly habit. A rare restart from the basal burl is a last resort, not a schedule.
Should it be one trunk or several?
Either is fine. One trunk is the usual street and specimen form. Several trunks echo the island groves. Cut the extra suckers if you want the form you chose to hold.
Take off the spent flower clusters after they brown
The white clusters age to brown, then gray, and they can hang for a year or more. That does not hurt the tree, but many gardeners take them off because they look tired against the new foliage.
- Wait until the heads have browned, after bloom.
- Cut the cluster back to the next live lateral, or to the branch it sits on. A pole saw reaches older trees.
- Leave the peeling bark. Pulling every loose strip is not required; the new cinnamon bark shows as the old gray strips shed.
Sun, drain, and the first-year water plan stay on How to Grow Catalina Ironwood.
When do I take off the old flowers?
After they brown, once bloom is over. You can leave them; they are only a looks job, not a health job.
If the base is a ring of new shoots, cut the ones you do not want while they are still small, and keep the leader you chose.
FAQ
Does Catalina ironwood need pruning every year?
No. Young trees need early training and sucker cuts. Older trees need less. Prune when stems cross, when suckers appear, or when you take off spent clusters.
Can I cut Catalina ironwood to the ground?
Not as a yearly habit. A ruined tree can sometimes restart from the basal burl, but repeated hard cuts weaken it.
Related guides
Recommended plants
References
- [1] UC Master Gardeners of San Luis Obispo County -
https://ucanr.edu/blog/uc-master-gardeners-diggin-it-slo/article/catalina-ironwood - [2] Waterwise Garden Planner -
https://waterwisegardenplanner.org/plants/lyonothamnus-floribundus-ssp-asplenifolius/ - [3] Friends of the Urban Forest -
https://www.friendsoftheurbanforest.org/tree-species-directory/fernleaf-catalina-ironwood - [4] San Marcos Growers -
https://www.smgrowers.com/products/plants/plantdisplay.asp?plant_id=1024
This note is part of Lyonothamnus Guides.
More pruning timing notes by plant live in Pruning Guides.
Updated: Reviewed by Bosquelle Editors