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Garden Fertilizer

Growing up, you were always told to eat your fruits and vegetables. We need to feed ourselves with nutritious foods that provide nutrients to make us big, strong, and healthy. Your plants are no different. As plants grow, they undergo an intensive process that strips nutrients from the soil. To replenish those nutrients and keep your plants happy and healthy, our plants need fertilizer. But choosing the right fertilizer for your garden can be a tough choice. Every yard is different from the next! 

O'Toole's Garden Centers understands that local Colorado landscape. Each yard is different from the next and requires a different fertilizer in order to keep your plants happy! That's why we keep our shelves stocked with different fertilizer choices and have our knowledgeable employees on hand to help you find the perfect fertilizer for your needs. Check out a few of our fertilizer options below and see our Fertilizer Plans page to learn more about how you can best take care of your garden. 


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Colorado's Choice Magic

Colorado's Choice Magic is a bloom booster unlike any other on the market today.  It is a concentrated water soluble plant food that is immediately available to plants.  It has been innoculated with mycorrizae - microorganisms that attach themselves to the roots of flowering plants, enabling them to absorb more of the nutrients vital to flower production.  This will result in more, bigger, longer-lasting and vibrant blooms!  Use on annuals, perennials and flowering shrubs beds or containers.

Espoma

Since 1929, Espoma Tones have been some of the finest organic fertilizers on the market.   Each is a complex blend of natural organics that break down slowly for steady, continuous feeding.  They’re safe to use around kids and pets and low in salts so they won’t burn.   And, all the Espoma Tones Contain Bio-tone® microbes which help increase root production.

  • Rose-Tone
  • Plant-Tone
  • Holly-Tone
  • Tomato-Tone
  • Bulb-Tone
  • Flower-Tone
  • Tree-Tone

Bio-Tone

Originally designed for professionals, Bio-Tone is the ultimate starter food. Bio-Tone combines an all-natural plant food with mychorriaze, microorganisms that attach to the root systems of plants and help promote larger root masses so plants establish fast. This helps promote bigger blooms and reduces transplant loss.

Neptune's Harvest

Neptune's Harvest fertilizer is made with fresh caught North Atlantic fish right on the docks of Gloucester, MA.  No synthetic materials are mixed into the fish hydrolysate, and the only manipulation the product undergoes is grinding and hydrolysis. This process yields a stable, non-odorous, liquid fertilizer that is an easy to use, safe product.  Neptune's Harvest hydrolyzed fish fertilizer rebuilds soil, gives excellent plant growth with increased yields, and is made from a renewable aquatic resource.

25% Off All 4-Packs of Annuals

Valid May 18-19, 2024

For one weekend only, we're offering this 25% off deal. Save the dates and save big!

$3 Off True Organic Preplant Starter

Valid May 1-31, 2024

For this month only, we're offering this $3 off deal. Save the dates and save big!

Chris Ibsen

Store Manager – Littleton

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

2023 Garden Giveaway Winners

Thank you to everyone who participated in the 2023 Garden Giveaway contest! It’s so fun to see how your gardens take shape after meeting you while shopping in our stores.   First Place @js_customs8   View this post on Instagram   A post shared by John (@js_customs8) “I’ve been working on my garden and landscape for 25 years,” says JS, …

How to Protect Your Plants from Late Freeze and Snow

Did you know that after May 2, there’s a still 50% chance of frost in Denver? Don’t let that stop you from getting your garden started now! O’Toole’s offers frost blankets and other products to help protect your plans from hard freezes. If you’re a vegetable gardener, we recommend this Insulated Plant Protector/Mini Greenhouse from Dalen. Tubes of water to insulate young …

Planting Winter Crops: A Guide to Growing Shallots, Onions, and Garlic

As the weather turns colder, many gardeners are ready to pack up their tools and wait until spring to start planting again. But why wait when you can start growing delicious winter crops? At O’Tools, you can find a variety of bulbs and plants perfect for winter gardening, including shallots, onions, and garlic. When planting shallots, it’s important to remember …

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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