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Google Scholar. Andrews FM The effect of temperature on flowers. Plant Physiology 4 : — Floral longevity: fitness consequences and resource costs. Floral biology: studies on floral evolution in animal- pollinated plants. The cost of floral longevity in Clarkia tembloriensis : an experimental investigation. Evolutionary Ecology 11 : — Burns KC Are there general patterns in plant defence against megaherbivores? Biological Journal of the Linnean Society : 38 — Effect of pollination on floral longevity and costs of delaying fertilization in the out-crossing Polygala vayredae Costa Polygalaceae.
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These flowers self-seed prolifically and will come back year after year. The feathery leaves and stems are a dull gray-green but the flowers make up for it by blooming in bright orange. The plant usually stays about 12 inches high but will reach 24 inches high under optimum growing conditions.
Another flower that spreads quickly and returns year after year if you let it go to seed is the African daisy. When removing plants, give them a good shake over the ground to release the seeds.
The plants are short--only 12 inches high--and produce small, dark green leaves. From early to late spring, the plants are all but covered with daisy-like flowers in shades of yellow and orange. Plants are drought tolerant and will grow in poor soil. Morning glories open only in the morning and close through the rest of the day and at night.
The flowers are blue and trumpet-shaped with a wide flare.
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