• Yarrow. A rock-hardy perennial that blooms all summer and grows to about 3 feet. Common yarrow (A. millefolium) has pinkish-white flowers; for deeper shades of pink and yellow, try ‘Moonshine’.
• Sweet Annie. This aromatic annual can reach 6 feet by fall. Deadhead flowers until late in the season, then leave a few to reseed.
• Silver King artemisia. The silvery mounds reach 2 feet, require no care and can be yanked out if they get too ambitious.
• Calendula. This 18-inch annual has cheery orange blooms from spring through fall.
• Purple coneflower. These vibrant native beauties are available in a range of colors and grow as high as 4 feet.
• English lavender. This is the hardiest lavender; start fast-growing ‘Lady’ from seed.
• Lemon balm. Perennial to about 2 feet, lemon balm is very aggressive, so don’t let it get out of bounds.
• Ozark sundrops. These evening primroses with large blooms are low-growing, unlike common evening primrose (O. biennis).
• Rose. Choose a hardy shrub rose suitable for Colorado. The Colorado State University Extension has ideas at
, such as ‘Harrison’s Yellow’ and the pink ‘William Baffin’ for high elevations.
• Goldenrod. If this native wildflower fits into your garden scheme, don’t amend the soil, as it does best in poor soil. Some varieties can grow to 7 feet when in bloom.
• St. John’s wort. This short-lived hardy perennial grows to about 2 feet.
• Sunflower. Many varieties of this tall annual native are available and easy to grow from seed.
Contributing Editor Kathleen Halloran lives and gardens in Austin, Texas.
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Garden Spaces: Plant a Water-Wise Garden