Lettuce is an ideal addition to any garden or household, and can be grown outside in the ground or in a greenhouse with hydroponics. This vegetable can be very tempermental, and loves cooler temperatures. Using hydroponics to grow lettuce is one of the best methods of growing it, as you can carefully monitor it and control the water and temperature.
Put a lettuce seed in each oasis root cube, the set them in the shallow dish and let them sit for about 2 weeks.
Cut holes in the lid of the large container that are large enough to hold the cones. Place one cone into each hole in the lid, then set aside.
Combine 2 teaspoons of hydroponic fertilizer, 1 teaspoon of Epsom salt and 2 teaspoons of the calcium nitrate in a cup. Add water until it is all dissolved together.
Fill the growing container with 5 gallons of water, then add the nutrient solution into it. Stir thoroughly.
Put the lid on the container. Put one growing cube seedling into each cone.
Keep the container in a place where there is around 7 hours of sunlight per day. Harvest hydroponic lettuce in 4 to 6 weeks after planting.