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When grown indoors, dill plants prefer temperatures on the cool side. So, adjust your indoor thermostat so that the temperatures hover around the low 70s. Dill plants may wilt and die if left in high temperatures for too long. Dill thrives in full sunlight. Place the plant in a south-facing window, or on a porch or patio that receives full sun for several hours a day. If left for weeks without enough sunlight, the dill will wither. As the dill grows, its stalk may not be strong enough to support the plants own weight. Help the plant by placing a stake in the soil near its base once the plant is about 1 foot (0.30m) tall. Over time, the dill will grow around the stake. Purchase a stake at a local hardware store or plant nursery. The stake doesn't have to be made from any special material. A dowel would suffice, as would any firm piece of wood at least 2 feet (0.61m) tall. If the soil feels dry, water the plant until water runs into the dish beneath the pot or planter. Water by pouring the water directly onto the soil from a height of 23 inches (5.17.6cm). This becomes important once the dill stalk reaches 2 feet (0.61m), because the leaves could mildew if watered from overhead. To see if the dill needs watering, press your finger into the soil: it should be damp, but not muddy or soaking wet.
Keep the dill plants around 70F (21C). Locate the pot so the dill receives 5-6 hours of direct sun each day. Insert a wooden stake near the base of the dill plant. Water the dill plants at the soil level twice per week.