I built two large raised beds in my new garden, but couldn't manage to fill them to the top. The bottom is closed with cardboard and has a layer of prunings and hay 1-3 cm deep. I planted anyway 10 young cabbage plants, 10 kales, 10 broccoli plants. I tried to gather the compost around the points where I would put the small plants. In their actual state, they have an available depth to root of about 7-8 inches, and space on the side about 50cm.
Would that result in any problem for the plant growth?
If I am to add some more soil later on, should I replant everything, or I can add directly on the top of the actual "small mountains" on which the plants are?
Notice: I live in Bristol, UK, and here it rains quite a lot throughout the year.