| 1. | These wind-pollinated annuals and perennial plants generate proportionally more pollen than trees.
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| 2. | It is a variable herbaceous perennial plant growing to 60 cm tall.
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| 3. | It is a herbaceous perennial plant growing to 30 50 cm tall.
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| 4. | There are far fewer biennials than either perennial plants or annual plants.
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| 5. | Cav . is a perennial plant native to Mexico and Central America.
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| 6. | It is a herbaceous perennial plant growing to 5 15 cm tall.
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| 7. | It is a short-lived perennial plant native to acidic grassland in Eurasia.
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| 8. | The Perennial Plant Association named it perennial of the year in 2001.
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| 9. | It is a perennial plant that grows between 25 and 100 cm.
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| 10. | Commonly offered courses include square foot gardening and perennial plant landscape design.
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