24 Best Cutting Garden Flowers | Garden Design CELOSIA (Celosia spp.)Plant type: Annual Bloom time: Summer through fall Height/Spread: 1 to 3 feet tall, 6 to 18 inches wide A longtime favorite for cutting, these heat-loving flowers come in a variety of eye-catching forms ranging from feathery plumes to crested cockscombs, in vibrant shades of red, orange, yellow, and pink.