I read a number of books when I was around 10-15 years old (roughly 1985-1990) by a female, Canadian, sci-fi author. I can't remember her name (maybe Amy something?) or the titles of any of the books but I'll try to describe a few plot elements. I can't even remember what bits where together in which books.
most books involved children, or 'young adults', in dystopian futures
one story involved a young boy who worked as a gardener in a domed city whose hand had been genetically modified into a set of garden shears
another story involved a young girl who was somehow telepathically/psychically linked to another girl a great distance away. Although they had never met she felt compelled to leave her city and travel to meet her
at one point a young boy and girl (possibly one of them the gardener) escape a city into a "wasteland" outer world and come across a landfill site full of strange items they don't recognize like plastic bottles and shopping bags