Trickier than others to grow, some of the best perennials can really test your nerves and gardening skills. Fussy about their soil type, climate or growing conditions, they can be off-putting for new gardeners and simply disregarded by others.
The comforting news is that often these outdoor flowering plants are widely known to have a reputation for being a challenge, and by tweaking their surroundings and care routine they can bloom happily for years.
