I started using ‘Deep Root trainers’ last year for my fava beans and other bean crops that need deep cells or for plants that don’t want the roots disturbed when planting. The cool thing about them is that the cells are 5 inches deep and shaped like a clamshell, with two sides that open up like a book. There are 8 sections total that fit snugly in a tray to hold them upright that comes with the kit. They are great as they have grooves that keep the roots growing straight instead of circling in the cell and strangling the plant. They also air prune when they hit the bottom of the cell. No need to transplant into another pot, just plant them out in the garden. You just put seed starting soil in each cell, pat it down and put the seeds in. The only drawback is the plastic clamshells are very fragile and must be handled super carefully to keep from cracking but knowing that, I am careful and have them for three years so far. You can get them through Amazon. Get the 5″ deep ones, NOT the 3″ ones.
Pictured above are fava beans in their cells, 6 are already planted in the ground. Just carefully open the clamshell and slide them out into your hole in the ground with no root disturbance for those sensitive plants that hate to be transplanted.
I also used root trainers with a hard to germinate french variety of beet called ‘Craupadine’. It is probably the oldest beet in existence. I have not had much luck with germination when planting these seeds directly in the ground so I decided to try them in the rootrrainers this year and have much better germination although still spotty. I thought being a root vegetable, they probably would not like to have that main root disturbed. I think they will do well. I won’t wait till the plants are too big. I am planting them outside after the first true leaves (cotyledon leaves) come out. So far 27 have germinated which is more than I have ever grown at one time. They are ready for transplant above. I am so excited as these are the sweetest beets I’ve ever eaten. The french farmer markets cook them over a smokey fire in foil and serve them still warm.