| 11. | It is a herbaceous perennial plant growing to 30 60 cm tall.
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| 12. | It is a herbaceous perennial plant growing 30-60 cm tall.
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| 13. | They are herbaceous perennial plants with slender, grass-like leaves.
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| 14. | It is a variable herbaceous perennial plant growing to 60 cm tall.
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| 15. | It is a herbaceous perennial growing throughout Europe in damp, open locations.
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| 16. | It is a bulb-bearing herbaceous perennial plant.
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| 17. | It is a herbaceous perennial found in most of the eastern United States.
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| 18. | It is a herbaceous perennial plant growing to 1.8 m tall.
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| 19. | It is a herbaceous perennial, growing up to 60 cm in height.
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| 20. | It blooms later than some herbaceous perennials, in mid to late summer.
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