Sprouting pomello seeds1/12/2024 as I did for my neighbors on their lime tree in this short video: Check for rootstock suckers often, and as soon as you notice one snap it off or cut it off close to the trunk or ground. You can see that the scion variety at the top has long ago died.ĭon’t let this happen to your citrus tree. Multiple trunks, thorny branches, unfamiliar and sour fruit. Here’s one old tree that I no longer water yet survives on winter rainfall in Southern California: As I watered some to try to revive them I got a lot of new growth, but not all of the new growth was desirable: much of what was still alive was rootstock. In 2013, I moved into a house with numerous old citrus trees in the yard. But no scion variety that we plant has leaves in clusters of three like this. Three-leaved rootstock sucker.Ī common rootstock used for many citrus trees is a type of “trifoliate” or three-leaved citrus, for example the C-35 citrange. If you have a Yuzu tree, you know what I mean.) Thorny rootstock branch.įinally, a sure giveaway that a branch is rootstock is if it has leaves in clusters of three. Rootstock branches are usually very thorny whereas the branches of the scion variety are usually not very thorny or the thorns are small. Other warning signs that branches are rootstock - besides the branches bearing the “wrong” kind of fruit and there being multiple trunks - include very thorny branches. Here on my grandparents’ kumquat it is all rootstock. Almost always when I see a citrus tree with multiple trunks, I find that it is all rootstock, or there might be a single trunk in the middle that is barely still alive that is the scion variety. It’s never a good sign when a citrus tree has multiple trunks. Rootstock had taken over the entire tree, somehow, and neither my grandparents nor I had noticed. Just a couple weeks ago, I checked that old kumquat tree to find this:Ĭan you see the only fruit in there? It looks like a lemon. All through my youth, I visited my grandparents’ in the summer and swam in their pool, and beside the pool was a kumquat tree that I snacked on. This is sad because a person might buy such a tree, plant it in their yard, and get some fruit in a couple years that is sour or seedy or ugly and wonder what kind of crazy mutation has occurred: “I bought a blood orange tree, but this fruit never gets bloody or sweet!?” One example of citrus rootstock fruit.Īlso, rootstock suckers can take over old citrus trees. Blood orange tree at nursery with rootstock sucker. I’ve seen rootstock suckers growing on citrus trees that are still in pots at nurseries. They can grow even before a tree is planted in your yard. Rootstock suckers on citrus trees are indeed little devils, and they often sneak by even the most knowledgeable and attentive gardeners. Here is an example of the severe, obvious bump, which citrus people often call a “bench,” on an old Valencia orange tree in my grandparents’ yard:īeware: If a branch emerges on the trunk from below the graft union, then it is rootstock - often called a rootstock sucker - and it will be vigorous and it will take over the whole tree if you don’t stop it. Here is a graft union that looks like a bump all the way around the trunk:Īs a citrus tree gets older, the graft union either almost disappears or it becomes a severe and obvious bump, depending on the kind of rootstock used. Here’s a graft union that looks like a diagonal line: Usually you can spot the union where the rootstock and scion were grafted together because the bark has a change in shape there. (How do they graft citrus trees? See this video of one method used at Four Winds Growers.) (Why do citrus trees have a rootstock? See my post “Fruit trees are grafted - Why? And so what?”) The scion is the part that gives you the fruit you desire - Washington navel orange, Tango mandarin, Eureka lemon, Oroblanco grapefruit, and so on. There is a rootstock on the bottom, and there is a scion on top. It’s not a branch of my orange tree it’s rootstock.Īlmost every citrus tree you buy from a nursery is actually two trees in one. That branch growing from the base of the trunk - that’s the little devil. My orange tree above looks fine, right? That’s what I thought until I crouched down and noticed this little devil:
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