Plant the dill seedlings in the container and water them well. Keep them out of bright sun the first day or so while they adjust to their new situation. Water often to prevent the container plants from drying out during hot summer days. Because dill matures relatively quickly, spent plants will have to be replaced with new ones during the season. Caring for Dill When growing from seed, reduce crowding by pulling up weak, spindly sprouts to allow 2 to 6 inches of space between them.
Dill prefers fairly moist soil throughout the growing season.
Once plants have established good root systems, water only when rainfall is sparse if your soil is decent and mulched. In thin, poor and unmulched soil, dill needs watering a couple of times a week when it does not rain. If possible, avoid overhead watering in favor of a drip or porous hose system. Spread a 2 to 4 inch layer of mulch on the soil around the plants when they are about 6 inches tall to discourage competing weeds. Mulch also helps keep soil moist and contributes organic matter to the soil as it gradually breaks down over the season.