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Perennials

Perennials are the cornerstones of our garden borders, providing vibrant flowers year after year.

Plants that live for more than two years are known as perennials; their Latin name means "through the years." They bloom generally in the spring, summer, or fall, with a few blooming in the winter, and many have lovely foliage as well. Herbaceous perennials are those that die back to the ground in the autumn and sprout in the spring. Some, on the other hand, are evergreen and keep their leaves throughout the year.

There are perennials for every style of garden, for any aspect or soil type, and they come in a variety of sizes, from small plants for the front of a border to medium-sized plants for the center.

Perennials come in a variety of sizes and shapes, ranging from low-growing plants for the front of a border to medium-sized plants for the middle, and giants a couple of meters tall for the back. They take swiftly to establish and expand, with most plants reaching full size in just a few growing seasons. Many perennials make great cut flowers, and the more compact species are ideal for container gardening. The blossoms on the majority of them are particularly attractive to pollinators.

With over 30 years experience dealing with the unique challenges that Colorado's climate poses, we have all the perennials that thrive here in the Rocky Mountain region. Here are just a few of the hundreds of Rocky Mountain Perennials you can find at all three O'Toole's Garden Center locations.


Shade Perennials


Part Sun/Part Shade Perennials


Full Sun Perennials

75% Off Holiday Decor

While supplies last

Save big on all holiday decor! 75% off everything while supplies last!

Chris Ibsen

Store Manager – Littleton

Over 30 years with O’Toole’s! A true gardening  expert! Email Chris Favorite plant: Evergreen

O'Toole's Staff
Apple Valley Greenhouse

Many of our annuals come from Apple Valley Greenhouse in Penrose Colorado. Apple Valley sources beautiful annuals from around the world and plants them in Colorado so they can deal with our unique climate. Video Tour!

Giving Tree

We’ve teamed up with the Notre Dame Club of Denver to give Christmas gifts to needy children. Customers pick a wish ornament, purchase and wrap the gift, and return both to the store by Dec. 12. Santa’s Helpers will distribute the gifts to some very happy little boys and girls!

Tips on Planting Bulbs for the winter

O’Toole’s has a great variety of bulbs. Click for tips on planting bulbs in the winter.

Littleton Garage Sale

All items must go at our Littleton location! We’re selling all the store fixtures, tools, wood, garden decor, office supplies, garden stones and pavers, trailers and more. 9/21-9/23 from 12-6pm.

All Blog Entries
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2020 Garden Giveaway Winners!

September 18, 2020
It was so inspiring to see all the creativity and gardening passion out there! Check out the winners of our 2020 Garden Giveaway! Read Full Blog Entry…
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Ask a Gardener – Japanese Beetle
June 11, 2020
Japanese Beetles damage plants as both adults and larvae. Adults feed on soft leaf tissue, leaving skeletonized foliage. Larvae feed on roots, especially turf grass, leaving dead, brown patches in the lawn. Cech out this blog entry for tips and products to address both the larvae and the adult bugs. Read more