Sandy soil in flower bed
I just moved to a new house with a garden. I am not a garden expert (grew up in apartments) but would love to learn. I noticed that the south facing side of the garden has very dry sandy-like soil and even if I water it (it absorbs water), it dries quickly afterwards. There are mature plants (fuchsia) on the flower bed but would like to plant other flowers (hydrangea). Will I need to remove the soil and put new/better one or can I do something to improve the quality (e.g. manure)? thanks for your advice!