Liquid fertilizers create a huge boost, especially when added to already fertile balanced soil. I urge every gardener to try fertigating a few plants and see what it does. A very small quantity of fertilizer applied to leaves has as much (or more) result than many times more of that same fertilizer put into the soil. One foliar feed can produce a dramatic increase in growth and plant health. But if the soil is seriously out of balance/deficient, the result will not be so good.