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The low-growing, dense nature of the Indian hawthorn makes it ideal for foundation plantings as a large-scale ground cover or as a low, informal hedge or divider. I would plant them at least 3 feet away from your pool or a foundation.

This link will refresh you on the care requirements.

https://www.gardeningknowhow.com/ornamental/shrubs/indian-hawthorn/growing-indian-hawthorn.htm

Alright... This one is going to be a little complicated... If there is any growth at all (which it looks to have a little at least) Than you will want to feed the whole bed some nitrogen... That will kickstart things a little... Pour unused coffee and tea onto the bed. That will be your cheapest method for feeding. Eggshells can help some as well... If you would like to go granular, I would recommend Botanicares line called organicare. Both grow and bloom are really good. Now... The hard part. You will have to go in and pluck any blackberry that come up by hand. It really helps to dig up the root with a handshovel. You will not be able to avoid feeding those suckers... Now, I will suggest spraying straight vinegar ONLY ON THE BLACKBERRIES. AVOID CONTACT WITH THE SOIL Acetic acid is toxic to plants... so the idea is to kill what you don't want. You get it in the soil, You run the risk of killing the plants you want to keep.

It will survive transplanting, and the best time to do it is in fall... but spring will be fine as well. This article will help: https://www.gardeningknowhow.com/ornamental/trees/hawthorn/hawthorn-hedge-transplanting.htm

These trees will live for many decades with the proper care. Here is a link that will help you care for them: https://www.gardeningknowhow.com/ornamental/shrubs/indian-hawthorn/growing-indian-hawthorn.htm

These shrubs are commonly planted close to a building or foundation, which is an indicator that their root system is shallow and non-invasive. This shrub will not be very difficult to remove.