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Bradderd wrote:

I’m glad you replied as you seem to be the person who gives most advice on this forum, thank you.
So I repotted 6 months (ish) ago and he was completely fine until I left him outside and overnight it went cold and rained a lot, this is him now:
What should I do?

How cold is cold?

If you have had your black pine indoors for winter, it would not have been prepared for frost and a single night of frost can do massive damage. I do not believe this is from your fertilizer, and one night of complete saturated roots will also not give you this.

Reply to Tropfrog

Thank you for the video I watched it twice. It’s nice to confirm I do have a black pine.

Herons video is great, the candles I have had on “Billy” (my bonsai tree name) simply get nowhere near 30cm but he is a lot smaller. The candles for my tree maybe showed initial signs of starting to sprout but never showed progress, maybe 1-2cm per year. I left it alone and then next year the pairs of pines would then grow out 1-2cm ahead of the previous growth, it’s each branch has say 4 sets of pines, representing the 4 years I have had him.

Heron states to remove earlier growth, should I do this? However the also states to leave them on to reinforce the tree, what would you suggest?

Should I wager this tree with bonsai feed or continue to dry it out? I read this is a good approach for an I’ll black pine

Thank you very much Tropfrog

Reply to letherback

Thank you for helping me out.

I confirm I have never left Billy outside in the winter term, I think you are correct he has never been prepared for cold weather, and the night he was outside the temperature did drop significantly. It is good to know that him being wet for a number of hours couldn’t have caused this damage.

I have noticed his soil is drying up slower, I think he is taking up water at a much slower rate because rod what has happened.

What would you advise me to do next to try and repair him?

Bradderd wrote:

the candles I have had on “Billy” (my bonsai tree name) simply get nowhere near 30cm but he is a lot smaller. The candles for my tree maybe showed initial signs of starting to sprout but never showed progress, maybe 1-2cm per year. I left it alone and then next year the pairs of pines would then grow out 1-2cm ahead of the previous growth, it’s each branch has say 4 sets of pines, representing the 4 years I have had him.

Heron states to remove earlier growth, should I do this? However the also states to leave them on to reinforce the tree, what would you suggest?

Your tree being indoors gets a lot less light than outside. If you put it in the sun, it will grow a lot bigger, faster. Your tree can also van 20cm candles, under the right conditions.

If it were mine, I would shield for rain a little, and put it outside. Initially in dappled shade, and in full sun a few weeks later.

You still have not answerd on the question how cold is quite cold. That the temperature dropped significally is just not enough information. Did you get frost that night or not? What was the lowest temperature that night?

Hello Tropfrog,

Sorry, looking back at weather reports, he fell ill roughly 2-3 weeks ago and weather reports then came down to a low of 2-4 degrees of a night, that’s probably correct. I do not remember frost but I do remember rain, that might have made the problem worse?

I have contacted Peter from Herons 名媛直播 directly asking him for advice too.

Should I continue to dry him out or water him with liquid feed included in the water?

You need to match tree care with what the species evolved in, as much as possible. Pines evolved in climates with short days in the winter matched with cold temperatures, then long warm to hot days in summer. And, the tree defines cold and hot on its terms, not the terms of the local air conditioner sales force.

We evolved following the sun and relatively recently figured out how to build an environment that is cooler or warmer so we don't have to migrate. The tree gets confused moving inside into warm brightly lit spaces.

Put it outside in the sun and leave it there.

Bradderd wrote:

Hello Tropfrog,

Sorry, looking back at weather reports, he fell ill roughly 2-3 weeks ago and weather reports then came down to a low of 2-4 degrees of a night, that’s probably correct. I do not remember frost but I do remember rain, that might have made the problem worse?

I have contacted Peter from Herons 名媛直播 directly asking him for advice too.

Should I continue to dry him out or water him with liquid feed included in the water?

Your problem was not leaving it outside. Your problem was moving it indoors. A tree that haven't hardened off in authum cannot handle frost. But 2-3 degrees is not a problem.

No, not dry out and not use fertilizer. Keep up with watering as you would normally do. But never ever fertilize an unhealthy tree.

But as said by everyone already. Bring it outdoors and never take it indoors again. That is the most crucial thing.

Tropfrog wrote:

Bradderd wrote:

But never ever fertilize an unhealthy tree.

We say this over and over but I wonder why. If I have a tree that lost a lot of leaves for some reason it seems it would appreciate some nitrogen to help it grow some more faster. I would think that not fertilizing would depend on the reason for not being healthy.

Are there experiments supporting this idea?

Unhealthy trees do not take up fertilizer very well. Most people use mineral fertilizer. Which is basically different kinds of salts. If we continue to add theese salts when uptake is limited there is a risk of burning the roots. The osmotic balance is disturbed.

My rescue repotting privet is now bursting into leaf whithout any fertilizer added. Once it is totally covered in leaf all that sugar and starches produced will need nitrogen and other nutrients to grow more and stay healthy. That is proboably by summer solitice: