Q.Wax Apple Seedling Trunk Narrows At Soil Level
Hi fellow gardeners, We have a Wax Apple seedling (also called Jambu). It sprouted on 2/1/20 and now it is about 3-4″ tall. We have it inside the house in a sunny spot. It seems like a healthy, happy plant. But its trunk narrows at soil grade level. I carefully pried the soil away with a toothpick to get photos. We are hoping someone may know if this is normal or not. If it is abnormal, what should be done to correct it? Does it indicate that the soil level is too high or too low? Should the soil be high enough to cover that narrow spot or is it better to make the soil level low to expose that spot? Please see photos. Thank you! Best regards, Gerry Mulligan

Certified GKH Gardening Expert
That is where the tree stem and roots meet! This should be, just barely, covered under the soil level.
Here is an article that will help you to care for apples in container:
https://www.gardeningknowhow.com/edible/fruits/apples/container-grown-apple-trees.htm