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This is my dawn redwood which just started its leaves again this season. Because of where I live (Apple Valley CA) we get high winds at times which I know will destroy new leaves and our summers are brutal hot. Also our winters have been below freezing the oast 2 years so I have moved it into my garage during the dormant season and kept the garage door raised during the day so it gets the morning and afternoon full sun in the 50s and 60s which everything seemed fine.
I moved it into a small greenhouse I have and then this started happening to leaves.

What happened and what did I do stupid. Or is it the stupid thing I did to cause this. It gets plenty of water and really good drainage as i have read it doesnt like dryness at all.

What is it that we are supposed to see? There is no reason for this to be in a greenhouse with those high temperatures.

The white tips of the leaves is what I was trying to show.

Perhaps a nutrient deficiency? The fact that it is all of the leaves and just the tips suggests that it is not a pest or disease.

When was the last time it was fertilized?

I just fertilized it last weekend because it was in dormancy for the winter and we were still having a bit of a frost warning.

Tips dried out; The heat was too much for the plant to evaporate enough water to stay cool

Still frost warning suggests that heat is not a problem at the moment.

Frosen roots during the night combined with strong morning sun can give the same symptoms.

Tropfrog wrote: Still frost warning suggests that heat is not a problem at the moment..

My greenhouse goes up to the 100F / 35+C in winter. If I do not pay attention now, I get 40C n the greenhouse at the moment.

My redwoods are outside and if we get a frost they get frosted, with no problem. I never fertilse this early