Ivan Mann wrote: Clicio, I had a student from Sao Paulo and she said climate here is about the same as there. We get some freezing in the winter, which by my estimate lasts three weeks.

Yes, I guess so, but...
Lately (in the past three years) summers have grown longer, winters shorter, and temperatures soared.
I was born in São Paulo, and apart from 1 year in NYC, 5 years in Rio, and 10 years in Europe I've been living here all my life. Surely whether patterns have changed from 20/30 years ago.

I'm also watering my trees twice a day since the temperature hovers around 30 C. I water once in the morning at about 6:30am and once again in the afternoon around 4:00pm. I try not to water too late in the evening so the trees don't sit in very wet soil overnight.

I have not watered my trees since friday. But.. unfair, been to the UK and India in-between. My irrigation system runs twice a day for 10 minutes. And my wife takes care to avoid casualties. Home in a little bit. Finally good weather. India was cold and rainy.

Some of the trees I've watered twice or even three times a day...(my garden is to the south.) the only trees that have endured the heat without any leaf damage are the tropical trees, my birch trees, and one of my yews. The crape myrtle was having some issues unrelated to the heat, and it's new leaves have no signs us heat problems. For at least the next few days there shouldn't be any issues.

LB: which irrigation system do you use?

Gardena micro-sprinklers. I have both foggers (directly overhead of my Yews and japanese maples) as well as 90 and 180 degree sprinklers. All overlapping so the whole area with my trees get sprayed by at least 1 nozzle.

leatherback wrote: Gardena micro-sprinklers. I have both foggers (directly overhead of my Yews and japanese maples) as well as 90 and 180 degree sprinklers. All overlapping so the whole area with my trees get sprayed by at least 1 nozzle.

the sprinklers and not the micro drips for individual pots?

tubaboy wrote: the sprinklers and not the micro drips for individual pots?

I do not know the micro drips. But with my substrate I doubt a dripper would work.

This is what it looks like when it runs:

Thanks. when I lived in an apartment, the drip system from Gardena worked pretty well for vacations up to two weeks... the problem with the drip system that I had outside would be that the individual openings get knocked off of their plant fairly easily... or pulled out by the birds. I'm looking for some ideas on what I can do for the future.

We have some rain today and it is not so warm. I may not have to water later when the rain stops but I may just have to water the small-shohin and mame trees.
The gods were smiling on us on Sunday. It was heavy rain to the north and east of us, but it stayed dry all day for our sale. Loads of people, I sold a few and I bought a mame cryptomeria and a Literati Juniper which is about 80cm tall as well as some small pots.

Clicio wrote: Surely whether patterns have changed from 20/30 years ago.

Thirty years ago we had roughly five months with the heater on, one month off, fivr months with the air conditioner on, and one month off. Now it is. 4-1-6-1, and the heating season has many days where the heater never comes on.

The elms in my collection starting leaving out January 6, and everything had leaves budding out end of February, about a month earlier than used to be.

Yes, patterns have changed.