Using root trainers
Plants that need a long root growth are not usually best sown in seed trays. These include Sweet peas (best sown in October or early spring) or veg such as beans, peas and runners. Basically things that like to climb that need long roots to stabilise them. These can all be sown now. I use Root trainers to grow these type of plants. These are made up of a plastic frame and inserts that fold together to make long growing pots. Several of these fit into the frame. They can vary in depth but I usually use 4” ones. Because the inserts are narrow the roots are encouraged to grow straight down. When they reach the bottom they break off and more roots start their growth from the seed. These Root trainers are also suitable for growing cuttings of plants. An added bonus to me, as I’m nosey, is that you can open up these inserts very carefully to see what is going on! If you treat them with care you can use these year after year, though they are a little fragile. The pictures below show a tray I sowed this time last year of Broad bean, purple French beans and White lady runners and how they looked at the beginning of June, just before planting.