Say I buy a biennial plant, in a pot, from a shop - say an angelica or a clary sage - is there a general rule about which year the plant will flower? That is to say, is it the norm to buy a plant like these now with the expectation that they would in full flower this summer? The plants and sites write up never seem to say. I bought an angelica last year and it didn't flower but looks to grow big this year (if I can keep the slugs off). I have a foot high clary that looks chunk and healthy, growing fast, but have no idea what the nursery's plan was. It does make a difference, especially if they really only last two years.
Many plants labelled biennial don't seem remotely so - my sweet williams and wall flowers go from strength to strength each year (over five years). Thoughts on this appreciate. Thanks