My French Tarragon seems also to have decided to grow after all. But I got excited too soon. I have now discovered the one in flower is actually the Mexican Tarragon. Both purchased from Sarah Raven as plugs.
I have found though there are one or two plants growing in pots under the coffee grounds or woollen slug pellets – so I wait to see what they turn out to be.
In the meantime, I have taken the decision to buy two plants already cultivated of the French variety and now have another go at cultivating it properly.