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Plant your lotuses in mid-spring once the average daytime high is over 70 °F (21 °C) and the pond maintains a warm water temperature. To help warm the water faster, you could also use a submersible pond or aquarium heater. Lotus plants will begin to grow only once the water and daytime air temperatures reach 70 °F (21 °C). If you don't contain them, lotuses will take over the entire pond. To maintain the water quality and keep fish and other plants healthy, plant individual lotus plants in separate 2 ft (0.61 m) wide containers. Containers specifically designed for lotuses are wide and shallow; you can find them online or at a garden center.  Choose a round container, as square corners would choke the plant. Steer clear of standard aquatic plant basket meshes, which won't control lotuses' growth and could injure the roots. To ensure the lotuses' rhizomes are contained, go for containers without drainage holes. Black containers absorb heat well and can help keep your lotus plants at a comfortable temperature between 75 and 85 °F (24 and 29 °C). Black is also inconspicuous. Depending on your taste, you could choose other materials, such as terracotta. If you're using a container, cover the bottom with 4 in (10 cm) of sand, clay, and aquatic plant fertilizer. Whether you're using a container or planting directly into the pond, dig a shallow hole in the soil mixture for the lotus tuber.  Dig the hole in the center of a container to give the tuber room to grow. If you're planting directly into the pond, placing the tubers along the edges in 2 to 3 ft (0.61 to 0.91 m) intervals will encourage them to spread. If you're planting directly into the pond, take care not to disturb the soil and muddy the water when you dig holes. While it might be a bit inconvenient, you can't plant the tubers directly into the pond before filling it with water. The water needs to time to dechlorinate and heat up to the right temperature. Lay the tuber in the shallow hole with the growing tips facing up. Position the tuber horizontally at a slight angle so the growing tips won't be covered by soil. Then gently cover the tuber with a 1 1⁄2 in (3.8 cm) layer of the soil mixture, and carefully weigh it down with heavy sand or gravel so it doesn't float. The growing tips are pointed and look like buds. The other end of the tuber is round. After planting a lotus tuber in a container, set the pot into the pond so the top of the soil is about 2 to 4 in (5.1 to 10.2 cm) below the surface of the water. If the pond is deep, elevate the container on top of bricks.  Lotuses can grow in water up to 18 in (46 cm) deep, but they'll bloom a lot faster if the soil is covered by only 2 to 4 in (5.1 to 10.2 cm) of water. If you're stocking the pond with koi, plant several lotuses in individual containers. Koi will munch on plants; the more lotuses and other plants you grow, the less damage individual plants will incur.

Summary:
Plant your lotuses once the water temperature has reached 70 °F (21 °C). Use 2 to 3 ft (0.61 to 0.91 m) containers to control your plants' growth. Dig a 1 1⁄2 in (3.8 cm) hole in the soil. Place the tuber horizontally in the hole. Submerge the container if you used one.