It very much depends on the location and the current growth state of your
Red Spider lily.
Once you have planted your
Red Spider lily, water them well once and then leave them. That initial watering will kick start their growth, but after that you can leave them be until you see shoots appear.
If your
Red Spider lily is in a pot, you will need to water them when the top 1-2inch feels dry. Container plants can dry out faster than bedded plants, so ensure that the soil is damp.
If your
Red Spider lily is planted outside in flower beds and borders, they will not require additional water if it has rained during the week.
The
Red Spider lily has some drought resistance, slight dryness can be recovered quickly after watering, but excessive watering can directly cause the plant to die once the seed ball rots, you need to stay cautious about how often you water the plant.