Angelika Maier wrote:Climate zones stated in say Dave's garden are often wrong. Sometimes it is miusture in winter.
Todd Parr wrote:I live in zone 4b. If I plant a zone 6 tree, it will die if we have a typical winter. Does anyone know exactly what kills it? I wouldn't think it would be the air temperature, because the tree goes dormant. I'm not sure how the ground temp would kill it, because it seems that once the temp of the ground gets below a certain point (within reason), that it wouldn't matter the temp. So maybe it's the depth that the ground freezes to? We can get frost 4 feet deep here. If depth is the answer, it seems that by mulching a foot deep, I would be effectively changing my zone up at least one point. Anyone have any answers as to exactly how this works?
Kathleen Driscoll wrote:My challenge is temperature swings (It will be 90 F during the day and 30 F at night) and summer frosts (it is not unusual to have a hard frost in July/August). I bought zone 4 fruit trees that didn't make it the first year because of this. We are supposed to be zone 5b, but I now ignore this and focus more on microclimates and protection for those mid-summer frosts. We also built a greenhouse below grade to help with the temp fluctuations. It's been a challenge to learn gardening here in Central Oregon that's for sure!!!
Marco Banks wrote:If found that the more mature my fruit trees are, the less chill hours seem to matter. In my zone, we're lucky to get 300 chill hours, yet I've got trees that are supposed to get 600 or more. Almost everything blooms, but perhaps not all at once or as aggressively as you'd hope for if they had received adequate chill hours. But I've got bees, so pollination isn't my concern. Generally, people want a big flush of blooms all at once so the tree attracts enough bees. But in my case, there are so many bees hanging around, even trees with a fairly minimal flush of blossoms still get good fruit set.
I've never had the experience of something dying because it's too hot or cold. But in our Mediteranian climate, things are relatively stable in a reasonable range year round.
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