Perennials: How hardy are they?, 1 by zest

zest wrote:
Hi gladiolus lovers :o))
Happy summer to you all (at last it hit us here)

Some of the glads were left out all winter, including G. callianthus, and they are ALL coming up fine.
They are supposed to be tender in my area, but was so busy last year, that they were left out.
They were planted 15cm/6 inch to 20 cm/ 8 inch. Planting deep could be the reason, not sure.

Have others any experience regarding this? It could be quite useful to gather this sort of info

Monica :o)