每日吃瓜

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This spring, three of my four Dawn Redwoods just stopped midway through leafing out. The foliage is very small, buds are still leafing out in late June.?
I can assume poor soil quality as it has been a couple of years since any new material has been added. If anyone can help me identify the problem and help me get these trees back on track I would be so grateful. One of the trees is about 25 years old and I’m just heartbroken and don’t want to lose it. ?Thank you in advance for your time and knowledge?

Why would you assume poor soil? Two years is not long between repots. I would be looking at whether it got dry at some point, apart from a few dead bits it looks fine, this species needs a lot of water, I would also be adding fertiliser from bud break onwards through the summer. Were all three in the same pot or separate?

The trees were in separate pots, they wintered in a greenhouse and I watered them once a week. They all started to bud at the same time, that’s when I fertilized. I noticed that one of the trees the buds were swelling nicely but not the other three. And so it continued, the one took off like they normally do but the other three were much slower. As you can see from the photos some of the buds are just now beginning to open, the ones that have opened have leaves ?1/4 of the size they normally are. The trees in their pots are along the east face of the house and get good sun from 9:00 am to 2:30 pm I water frequently and fertilize every other watering. The biggest ?one I’ve had for 5 years and it’s only been repotted once. The others were repotted in 2023 ?
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The fact that they were in separate pots suggests watering problem. I would say possibly got dry, I would not have them in a greenhouse over winter unless you get cold, below -5C at least, they probably are ready for re potting next spring, but I don't see a problem.

I agree with Geoff, proboably a watering issue. I put my dawn redwoods on trays in summer that collects some water when watering. They really like wet feets all summer.

I keep all my trees in greenhouse in winter. I suggest that for anyone experiencing more than a week of constant temperatures below 0 degrees. Just a few hours of sun will get the greenhouse over 0 and give the trees a chanse to drink. If you have daytime temperatures above 0 most winter as Geoff have, greenhouse keeping proboably do more harm than good.

Cuttings from dawn redwood I keep in a heated area in the greenhouse at 5 degrees minimum for the first 2-3 years. That is proboably the best overwintering for all temperate and subtropical trees in colder areas, but it is expensive so I just do it for trees that absolutely needs it.

Just a note on previous comments. We all just assumed northern hemisphere and Celsius temperatures. If you are southern hemisphere this changes.

Also, the temperature advice references 0C=32F and 5C=41F.

At International 每日吃瓜 in northern New York Bill Valvanis keeps his trees at 27F=-3C for the winter, moving them into temperature control in October and out in March. I mentioned that our low in Birmingham was 27F the previous year and he sort of laughed.

I thank everyone for their comments and suggestions. I live in Ohio. Our winters can be brutal. We have weeks where the temperature is near or around 0 F. That’s why I’ve been keeping them in a greenhouse. I make every attempt to make share the spike has some moisture.?
the largest of my trees is what’s worrying me the most. He’s 25 years old and the leaves are so small and delicate and there are still buds opening that have been there since spring. We are experiencing a heat wave with temps in the high 90’s F. So i
moved him into a spot that gets indirect sunlight because the leaves were starting to burn. I also gave them a good shot of fertilizer. I’ve babied and nursed those plants for years and I’m just sick to my stomach . Thank you again for your help?

Not enough water. Stand them in bowl of water. all summer.?

I agree with Geoff. More watering.

After having a tree for 25 years one would think that one have the watering right but things change. Trees grow bigger, organic compounds lose water retention capacity when broken down, inorganic soil components increase water retention and climate changes as well.??
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