Botanical Name: Portulaca grandiflora spp. Sun Exposure: Full sun Soil Type: Sandy, well-drained Soil pH: Acidic to neutral (5.5-7.0) Also known as moss rose, portulaca is a stunner during the hottest and driest summer weather. Thanks to its succulent leaves, portulaca will last a while without watering. However, the plants bloom best when they receive an inch of water per week.