Late pasnip flowering

My parsnip plantings were designed to

1. cross up some promising lines, and 
2. do a seed increase of Kral.

The first planting of 4 different varieties was autumn last year - about 14 months ago, with the plan to get some  autumn growth, have plants subjected to a winter regime, then get flowering in the summer. This worked, and I've got lots of potentially crossed up seed.
The second planting to increase Kral was in the early spring about 7 months ago, with the plan to grow them out over summer, over winter this winter just approaching, then collect seed next summer - but the Krals have panicked, and most of them have put up flower stems, with buds forming. Oh woe! I'm worried that winter won't be suitable for seed to mature. And I'm not going to be around for the next 3 months to check progress. Hope they last 'til August.