Pruning Magnolia Stalarta

Question

Also I have a problem with my Cornus Chinesei

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Answer 1

Pruning will not correct this issue, unfortunately.

The first thing to do will be to test the nutrient contents and pH of your soil. My first guess is a deficiency of phosphorus and magnesium, but this can also be caused by a pH that is way too low, as well.

These articles will help:

https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-soil.htm

https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/soil-ph-plants.htm

If your soil tests are normal, then you may have a moisture issue. Wet soils that do not have a chance to dry out between watering will suffocate roots. This will prevent roots from taking up nutrients.

This article will help you to test for soil moisture:

https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-moisture-in-plants.htm