If you read what the actual question was you will see why I answered this way. This is a recommended method for transplant only, when the roots are much smaller than the space they are in. If you water with runoff on a newly transplanted plant it will be too saturated for the roots to grow properly. They will grow, but they will grow slowly and you risk giving them rot. You want to water lightly to encourage root growth after transplant. The soil you transplant into should be slightly moistened but not too wet. I usually spray it with RO water until it feels just right then when the plant I want to transplant's soil is nice and dry I transplant, cover root ball and water lightly for the first two waterings. It has never proven me wrong and it just makes sense to do it this way. Watering a newly transplanted plant too much at first can lead to a lot of unnecessary problems. After the 2 light waterings resume your regular schedule. Pertaining to me watering my plants lightly here and there..this is also something I have found beneficial for root growth. It is not done every time because doing that would cause toxic salt buildup and a mess of problems. Only once in a while...usually once or twice a month when I am low on distilled water.
