By Juliafawdry
United Kingdom
I have seen eryngium giganteum described as both a bianual and perenial, which is correct
On plant
Eryngium
- 18 May, 2011
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More technically it should be described as monocarpic, ie it dies after flowering. It is not a biennial because it can take more than two years to grow to flowering size. And you will always come across the odd awkward plant that regrows the year after flowering! They are easy to grow from seed so you can keep propagating them.
18 May, 2011