WTF is wrong with tarragon?!

[shrinkrap]

Another thread involving tarragon.

Tarragon, cilantro & other herbs - why are they so difficult to grow?

I have tried growing them 2 or 3 times in different years… Young healthy plant bought from shops in spring, repotted in a bigger pot, normal soil, sunny spot, it didn’t really take off, simply did nothing, no new branches nor much new leaves, or if there were new growth, new leaves became miniscule. After autumn, the plant died. I have also tried seeds, but nothing grew out of them. I wonder what I did wrong.