Peony bushes require fertile, well-draining soil. Newly planted peonies need an inch of water every five to seven days to let the soil settle around the roots.
For mature peony plants, it's best to water the soil and root every 10-14 days, depending on the weather conditions. All watering should take place early in the morning.
When it comes to newly planted peonies, water them as soon as you sow them in the ground. They’ll then require an inch or two of water every week for the first year.