I live in northern France and am presently growing some Phormium Tenax.
They are about 2ft long now. Presently they are covered, but I would
like to know at what stage they can handle our climate to be planted
out. They were grown from seed last spring.
What colour is the foliage? In general, the purple-leaved ones are
somewhat less hardy than the green or variegated forms. FWIW, the
non-purple ones seem to be hardy in the south of England, so I see no
reason why they shouldn't behave similarly in northern France.
If green, yours should be safe to plant out now. Be aware that they
grow to a pretty large size; in the right climate they'll be 6x6 foot in
less than 10 years.
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