Moss rose plants (Portulaca grandiflora) "are popular flowering annuals sold in the spring. If you see leftover moss rose plants on clearance sale in the summer, you might notice the plants are usually just as lovely as they were in the spring, which is a testament to the plant's toughness." -Jamie McIntosh (The Spruce) Saw this flower when my sister and I went to the city hall. there were many other beautiful plants in the entrance of the hall but this flower really took my eyes.