How to make a cocktail fruit tree
Prunus on one trunk. Grafting several varieties onto one tree
Four different stone fruits on one trunk, in a space that only fits one tree, plus the pruning it takes to keep all four alive.
Prunus on one trunk. Grafting several varieties onto one tree
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The long version

A cocktail tree, also called a fruit salad tree or a family tree, is one rootstock carrying several grafted varieties, each on its own limb. It is genuinely useful when you only have room for one tree and want fruit from July through October, or when you need a pollination partner but cannot fit a second tree. It is also the most commonly abandoned project in home orcharding, for one reason: the varieties do not grow at the same rate, and the tree will not balance itself.

Everything on the tree has to be from the same genus. Prunus is the usual choice, because plum, apricot, peach, nectarine and almond will all graft onto each other, and cherry will too, though it is more difficult. Malus gives you an apple and crabapple tree, and Pyrus a pear one. What you cannot do is mix genera. Apple and peach on one trunk is a photo on the internet, not a real tree. Then match the growth rates as closely as the varieties allow, because a fast grower next to a slow one is what ends this project.

Start with a young tree, either bought rootstock or an established tree you are regrafting, and get its shape right before you graft anything. You want three to five main limbs coming off the trunk at wide angles, spaced evenly around the tree and roughly level with one another. Each limb will carry one variety. Limbs at different heights are the first way a cocktail tree goes wrong, because the highest limb gets the most light and outgrows the rest.

Whip-and-tongue graft each variety onto its own limb, using dormant scion wood and the same cambium contact rule that every graft depends on. Do them all in one session so they heal on the same schedule. Put the slowest-growing variety on the highest, sunniest limb and the fastest-growing one low down and shaded. Holding back the strongest variety on purpose is the one structural advantage you get, and you only get it once.

This sounds like housekeeping, but it is the difference between a cocktail tree and a tree full of mystery fruit. Once the leaves are out, four Prunus varieties look nearly identical, and if you cannot tell which limb is which, you cannot prune them correctly. Peach fruits on last year's wood and plum fruits on long-lived spurs, so pruning one the way you prune the other removes the crop. Use engraved metal tags wired on loosely rather than marker pen. Ink fades within a season, and tight wire cuts into the limb.

This is the step the tree cannot survive without. Each winter, find the limb that has outgrown the others and cut it back the hardest, and leave the smallest limb almost untouched. That is the opposite of normal pruning instinct, and it is the whole job. Left alone for even two seasons, a vigorous peach will shade out an apricot beside it, and the apricot will not recover. Watch for shoots coming from below the graft joins as well. Those are the rootstock growing, and they are not part of what you planted.
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