The propagation of leek plants for the coming season has been quite difficult. The cold and wet weather conditions in March, April, and early May have delayed sowing and/or reduced germination and emergence. Quite a few growers have switched to a greenhouse for propagation, and this is not the most ideal scenario either, according to the Vegetable Production Experimentation Centre.
Plants moving from inside to outside have a hard time adapting to the changed climate. In a greenhouse, it is usually more humid, and there is no wind, so there is less desiccation. Especially in poor weather during transplanting, plants from under plastic or glass can struggle.
Source: PCG