Seeds and seedlings demand moisture close to the soil’s surface, but more established plants need deep watering to develop roots that will find water in the subsoil when drought strikes. Just be careful not to overwater! You want soil that’s damp, but not soggy, down to 5-6 inches below the surface. In waterlogged soil, roots are deprived of oxygen and may lose the ability to take up water. If your plants’ foliage begins to brown at the edges and fall from the plant, you may be over watering.