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Should I remove half of a forked birch sapling? If so, when?

I've just planted what I hope will someday be a birch tree (Betula utilis var. jacquemontii). At the moment it's pretty small, about 60cm tall. It has two uprights, both about the same size. The fork is just above ground level. I'd like a single-stem tree, not a shrub or a cluster, so I think I should remove one of the leaders. Is that right? 

If so, what's the best time to prune it off? Some things I've read say because I'd basically be removing half the plant, I should wait until the tree has dropped its leaves. On the other hand, I feel like I should correct the shape as soon as possible. 

Is there a rule of thumb for which to remove? Both are the same height, but one has another (lowish) offshoot.

This is what it looks like at ground level:



This is the whole tree. I arbitrarily chose one of the shoots to stake, just to give it some support.

Posts

  • ObelixxObelixx Posts: 30,090
    Birches can bleed a lot when pruned so yes, wait for leaf fall when it's gone dormant or, at the very least, high summer when the flow of sap is less.
    Vendée - 20kms from Atlantic coast.
    "The price good men (and women) pay for indifference to public affairs is to be ruled by evil men (and women)."
    Plato
  • Thank you! “Wait” it is. I’ll have to hope the staking persuades the tree that the upright branch is more interesting to grow.
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