Alliaceae, Allium porrum(family)
Forage for pollinators: Produces Nectar in abundance (when left to flower, and especially when grown field-scale for seed production the old traditional way) for Honeybees, long and short-tongued Bumblebees and Solitary bees. Honey can be produced from fields of leeks and onions. In our gardens leeks are normally harvested before going to flower, but it is worthwhile to leave some of your healthiest-looking leeks to run to flower and seed and they look stunning into the bargain.
Flowering time: June, July, August
‘Giant Winter’ also known as ‘Seigfried’ is a late season leek which matures from January having stood all winter.
Sow in deep modules or tubes (loo paper rolls work), or a seed-bed from March to May, transplanting to final position in June (dibbing holes wider than the transplants, holes spaced at 15cm between plants by 30cm rows; or equidistant at 18cm. Trim the roots by about a third and drop the baby leeks in but do not firm the soil up, just leave them loose then generously water them in.
If you wish to save seed of one variety, only allow one variety go to flower as they do cross-hybridize. However, it is safe to let onions flower as they don’t cross with leeks.