Terraced grow bag's may be your answer Kate,Most new properties we have looked at have garden's to small for a grow bag let a lone a terrace,I saw a house on line in Devon with a garden like your photograph just a bit to remoat on Dart moor. Oldchippy.
Thanks for the interesting read! I have made 2 raised beds using wooden boxes from a builders yard. The squashes will be growing out of them and should look pretty with the fruits hanging out. Good luck with your garden and looking forward to Part 2,3 and 4. :0)
Posts