Solidago ptarmicoides
Looking for a really different native Goldenrod? Solidago ptarmicoides (aka Oligoneuron album) is distinctive within the Solidago genus in having white to cream-colored daisy-like flowers, in heads arranged in a flat-topped cluster rather than in an elongated raceme. Known as Prairie Goldenrod or White Upland Aster, one plant can sometimes produce as many as 50 small heads, blooming from August to October. It is an herbaceous perennial that grows in clumps 12 to 24” high and wide, native to dry, sandy, usually calcareous soils, cracks in rocks, limestone pavements, rocky outcrops, grassy slopes and prairies from Quebec to Saskatchewan south to Arkansas, and west to Colorado. It’s cold-hardy to USDA zone 3.
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The end of summer doesn’t mean the end to color in the garden, on the contrary, you can plan and plant now for a vibrant wave of color, and habitat for our insects and birds, that continues all the way to hard frost! From native and water-wise perennials and shrubs, to trees (including fruit trees) and grasses, the selection is vast.
HARLEQUIN’S GARDENS 2025 TOMATO STARTS
Fall is among the best times to plant perennials. While we may begin to wilt from late summer heat, many plants rise to the occasion and burst into bloom! As days begin to grow shorter, perennials spend the next few months developing root systems or taproots that delve well below the hot, dry surface soil. Pollinators depend on finding pollen and nectar sources through the entire summer, so it’s important to include late-summer and autumn bloomers in your garden. 
Circa 1857, this delicate-looking yet easy-growing North American native has composite 3″ globes of star-shaped, sparkling white flowers with pale lavender stamens tipped with purple anthers and sturdy stems.
Hardy Geraniums are some of the most versatile an adaptable perennials for our area! Available in many colors and habits, they can be useful in sun and shade, moist and dry, as individual specimens, companion plants and ground covers.
Bur Oak (Quercus macrocarpa) is a majestic, slow-growing tree reaching 60 to 70’ in height and spread, and is typically very long-lived (think 200, 300+ years!). It’s the sort of tree you plant for the benefit of the generations to come. Many oak species don’t thrive in Colorado’s alkaline soils, but Bur Oak is a happy exception. It is also drought-tolerant once established, even in dry clay, and can handle city conditions quite well. Bur Oak’s strong wood and strong, almost right-angled branch connections resist breakage in wind and snow. 
Our 2022 Fall Members-Only Sale has finished, and now our Big Fall Sale has begun, with 20% off for everyone! Plants included in this week’s sale are:
Our best selection of plants for the 2021 season is here now! Our selection of plants for shade and part shade has never been better, including Hosta (many kinds!), Ferns (5 kinds!), Bergenia, Hellebore, Foxglove, Geranium (many), Coral Bells (many), Monkshood, Persicaria, Pulmonaria, Golden Wood Poppy and Clematis (lots!), and some new selections, like Solomon’s Seal (2 kinds)!
It’s time to buy your ‘seed’ garlic, which you should store in a cool, dry, well-ventilated place until planting time, from mid-October to mid-November. Seed garlic bulbs are specifically chosen for planting because they are the healthiest bulbs with the largest cloves, and they are intact. By planting the largest cloves, you’ll be rewarded with a harvest of big, juicy bulbs.
Hummingbirds are zipping and humming and sipping around our gardens, partaking of the summer’s bounty of nectar-rich flowers, many of which are ‘color-coded’ specifically to attract them. And you’ll want hummers in your garden, not only because they’re beautiful, not only because some plants depend on them for pollination, not only because migratory birds are imperiled, but also because they eat prodigious numbers of small flying insects like mosquitoes! And did you know, some hummingbird have been known to live up to 25 years!
As Colorado gardeners, we’ve come to expect snow in October (last year it was October 10), but September?! In the past 24 hours, we saw a temperature swing of more than 60 degrees, going from record-breaking heat to one of the earliest recorded snow falls in the state (the earliest recorded area snowfall was in 1961 when Denver received over 4″ of snow on Labor Day).
