Some plants, including seedlings, fare better if you water them by hand. Some plants--such as tomatoes, squash and carrots--attract pests if their leaves get wet. Bigger plants--such as broccoli, cabbages and cauliflower--also grow best if hand-watered. Overhead watering can fall on the leaves of larger plants and leave roots dry. Plastic watering cans are a lighter alternative than buckets or metal cans. Nozzles with small holes are designed to create a light spray ideal for young plants and seedlings. Larger holes give a heavier spray of water.
Fill a plastic watering can with water.
Tip the watering can to let water stream out of the nozzle.
Pour water directly onto plant roots.
Repeat filling the can and watering plants until your plants have plenty of water to the roots.