I think that his summer (if we get one) will show up the same problem that the last prolonged deluge caused. Folk were coming into our allotment shop, and complaining that their young plants had stopped growing.
Thinking about washed-out soil, we advised regular dressings of Growmore or some other such soluble fertiliser, and top dressing with something slower. An article I later read confirmed the problem, but also added that without sufficient sunshine, the plants also suffered from lack of photosynthesis.