If you generate a winter map in Alpha Survival, all the trees will have leaves. But why? In a real life winter situation, trees don't have leaves, obviously.
So, why not have leaves slowly die off if the the SnowCovered value is 1? Of course, basic trees would look ugly with just a big wooden pole standing there, but if all the trees were to become like the new trees, it might actually look pretty nice.
That would actually be pretty cool, especially since each leaf would get destroyed fairly slowly. Good luck getting to plant your own trees though; you miss the sapling at the start, you're done for good.
Tree stumps even with the way they look now would look ugly. I say when it becomes winter leaf blocks change into branch blocks which are brown and made up of lots of little twigs that are on the inside of the block (sorry it's hard to explain). When hit they drop saplings as normal.
This way trees aren't green in winter and players can still plant trees. The only downside I can see is that the trees wood (ho ho) grow without leaves which is slightly impossible.