I grew mine straight on the plot last year and they seemed fine. I cut them up, put them in the freezer, now i keep forgetting to use them. Remembered last night (first time for ages) and mixed them into mashed potato, lovely. Is the seed ok (new this season) or have you kept some seed from previous. Think i set them same time as spring onion, march onwards. Seemed to take quite a while to grow until ready, if i remember right.