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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

15% Off All Outdoor Plants

Valid through July 31

It's mid-summer and all our outdoor plants are on sale now at 15% off! Offer excludes houseplants.

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Gift Cards

Consider a gift card for birthdays, Mother's Day, or the Holidays. Shop together, plant together and watch together as your gift grows and blossoms into the future!

Tomatomania 2025

Welcome with Pat O’Toole Today’s the big day, Pat. That’s right, yes. TomatoMania. We’ve been waiting. Anticipating. How’s it going with checking people in? Great. We’ve already had, uh, several people for the winners from the, uh, early, early bird contest. So just finished putting the tomatoes out so they’re fresh off the truck ready to go? Today is TomatoMania, …

Tomatomania 2025 Photo Contest

Think you’ve got the ultimate tomato garden? Show us what you’re growing for a chance to win up to $300!

Cultivating Well-being with Houseplants

How do you escape the stress of today’s news and the artificial lights of your computer screen and smart phone?

Our customers say that gardening is part of their “me time”, and that it helps them feel hopeful and positive, the same can be said about caring for houseplants.

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