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Calla lilies will grow multiple leaves and flower stems from one bulb. If you’re planting 1 bulb in a pot, use a 5–6 in (13–15 cm) deep pot. If you’re planting 2 or 3 bulbs in the same pot, use a pot that is around 8 in (20 cm) deep. Calla lilies can be a bit picky about their temperature. Their ideal growing conditions are between 55 °F (13 °C) and 75 °F (24 °C). If your home gets hotter than 75 °F (24 °C), you can use mulch in the pot to keep it cooler.  Spread a thin layer of mulch such as wood chips, sawdust, straw clippings, or pebbles on the top of your soil if needed. Be sure to keep your lily away from air conditioning and heating vents. Calla lilies need plenty of bright light during non-peak hours of the day. Too much midday sun can scorch their leaves.  A window facing east or west is best for your indoor lily because your lily will get either the morning or afternoon sun while still giving it some time in the shade to cool down. The east or west side of your home will work best as an area if you’re planting your lily outside. Danger of frost ends at various times for different regions, but you want to make sure whenever you plant your bulbs outside is after this time. As the first day of spring in your region approaches, pay attention to the frost levels in the mornings. If they are decreasing, your almost ready to plant. Well-draining soil dries easily after rain. Don't plant your lilies in a low spot in your garden, nor a place that holds puddles of water for more than 15 minutes after watering. If the soil is sandy where you live, you can add fertilizer to the soil to help your lily grow. For clay soils, mix in at least half potting soil to the area where you’re planting your lily. Calla lilies grow naturally near the edges of ponds, so they like moist soil. Don't allow your lily’s soil to dry out completely, but take care not to over-water it, either. Soggy soil will cause the bulbs to rot. Start with a bit of water and allow that to soak in. Check on your plant each day to see if the top is starting to dry; if so, add more water.

Summary:
Choose a pot that is 5–8 in (13–20 cm) deep for indoor lilies. Keep indoor lilies in a room that stays between 55 and 75 °F (13 and 24 °C). Place lilies in a spot that gets 6 hours of non-midday sun per day. Plant bulbs outside after the danger of frost has passed. Provide well-draining soil for your bulbs. Water your plant so the soil is always moist but not soggy.