Oh, Obelix, that is so hard. I think the only way to look at it is "there is a season for everything" - you have had the gift of this garden (for how many years?), you used it, you treasured it, and you nurtured it. It has given you so much joy, and nothing can take away that joy and the memories. You will have them for the rest of your life. If the time has come to hand it on, so be it, but as I say, that is so very hard.