New School Fall Gardening Stretegies

By Katherine Placzek

With fall approaching, many of you are getting ready to put your garden beds and other portions of the landscape to bed. With a more eco-friendly mindset, we would like to suggest a couple of tweaks to your typical routine.

Old school: Raking and bagging leaves, tossing them out for the trash.

New school: Rake leaves from below trees, and use them as mulch around your perennials, shrubs, or on top of your vegetable garden beds. You can also run these over with a lawn mower to mulch them into your grass. 

Why: Organic matter, including yard waste, is the most prolific item in United States landfills.  Consequently, this unsustainable practice directly contributes to greenhouse gas emissions. Conversely, organic material returned to the soil reduces your environmental impact while providing a useful garden resource. These local sources of organic material and nutrition (from your own yard’s leaves) will feed and insulate your yard all winter long! Decomposing leaf matter enriches the soil, adding carbon and nitrogen to the soil, while plants “sleep.” Leaves also create safe places for native bees and other pollinators. Did you know that almost three-fourths of Colorado’s native bees nest and overwinter underground? Tip: Deeply water the leaf litter in after it has been placed. This creates a wet decomposing mat that will not blow away as easily.

If you have excess leaves that you are not going to be using, please feel free to bring your bagged leaves by our nursery gate (located at 600 N. 18th St. Colorado Springs, CO 80904). This is a community pile that other members come to gather for their own gardening usage.

Old School: Trim any perennials and remove them before the first snow.

New School: Leave all of your woody stalks, leaf matter, and ornamental grasses all winter long!

Why: This allows for winter interest and provides shelter for any hibernating insects. This is especially true for native plants that act as habitat for many native and beneficial insects. Larger life forms, including birds and mammals, will also benefit from grass seed heads left standing, and other plants that provide shelter in the harshest months. If this is unsightly for you, trim your plants, but leave the stems and other leaf matter on the ground to help create shelter throughout the winter. When soil temperature has reached 50 degrees Fahrenheit it’s the preferred time to begin trimming these perennials in the spring, after many insects have completed their wintering cycle.

Old School: Let the winter snows water your outdoor plants.

New School: Water trees, shrubs, and perennials on nice days throughout the winter.

Why: Unfortunately Colorado Springs does not get enough reliable winter moisture to overwinter many plants. This is especially true for newer plants that do not have an established root system yet. Many trees and shrubs, even those that are well-established, should continue to be watered on warm winter days from October through March. When it gets up to 40 degrees Fahrenheit, pull out a hose or dust off your watering can and soak up some of those winter rays, yourself, while you water. Make sure you unhook any hoses after use, as temperatures can cause freezing in the hose bib and other hardware. 

Old School: Say goodbye to gardening until spring.

New School: Fall and winter sow, including vegetable and perennial flower seeds.

Why: Many annual vegetables and perennial flowers have a natural cycle where they drop seeds or fruit in the fall. Mimic nature and plant some of your own seeds in the fall to see what comes up earlier and hardier in the spring! In the vegetable garden, this especially works for cold hardy greens. Think spinach, lettuce, arugula, radicchio, etc. For perennial flowers, like wildflowers, it is recommended to put these seeds down in the fall, as many of our native flowers require a cold stratification period. While many people may set up sections in their freezer and fridge for cold stratification processes, direct seeding in the fall eliminates the juggling of space in your fridge/ freezer. Let the ice cream stay where it is!

Old School: Wait until spring to amend any of your garden beds.

New School: Amend your garden beds in the fall so you can plant right away in the spring.

Why: Fall is a good time to test your soil so you know how to amend your beds. Our soils typically fall in the basic pH range here in the greater Colorado Springs area. This can impact how readily available nutrients are to our plants. Do your research and get your soil properly in shape for your spring! Remember that you can also amend with what nature provides; leaves, manure, compost, and other organic matter. These sources do not have a precise N-P-K (macronutrients: nitrogen, phosphorus, potassium), nor spelled out micronutrients (calcium, magnesium, iron, etc) so it is recommended to test your soil in the spring again to see how your soil has changed due to any unregulated organic material. We offer pH and N-P-K, testing in-store, but the CSU extension office also offers a wide range of soil tests.

Now that you know these new school techniques, you might just try other new gardening techniques in the growing season. I know, I know- I am getting ahead of myself!  Happy gardening!

Rick’s Deep Freeze Guide

In preparation for our first deep freeze coming this Sunday, Rick’s Garden Center would like to remind our fabulous customers to take some steps beforehand to help your plant friends and tools out.

• Water in outdoor trees, shrubs and perennials and cover root balls with mulch.  Do not mulch up to the trunk.  Moist soil conducts earth heat better than dry soil.  The mulch will help keep in the heat and protect the sensitive root ball.
• Rose bushes, mulch up to the graft union at the base of the rose trunk.  You can use a rose collar or just pile up mulch up to and above the graft union.  The graft union will look like a bulging area on the main trunk just above the soil line.
• Bring in any tropical plants, cacti or succulents that are not at least a zone 5 inside.
• Check and move any plants that are blown on by heat vents.  This will dry out the foliage in no time!
• Outdoor trees, shrubs and perennials planted in pots should be insulated with burlap bags or mulch and placed against a south or west wall of your home.  Avoid watering these before the freeze.
• Water in newly established lawns and grass.
• Go ahead and plant those mums you bought in the ground..  They may come back next year!
• Disconnect and drain all hoses and drips lines from spigots
• Cover newly planted bulbs with leaf, needle or straw mulch.
• Blow out that sprinkler system!
• After the freeze, you do not have to pull up all of the dead material, so that pollinators and other insects have a place to overwinter.

Winter Watering on the Front Range

Our often dry, windy winters here on the Front Range can be especially tough on landscaping plants such as perennials, trees, shrubs, and lawns. Most plants need moisture throughout the winter to prevent root damage, so developing a winter watering schedule can help to protect your landscaping.

If roots are damaged over the winter, the “winter kill” is not obvious until summer. A plant or lawn may green up nicely in the spring, but in the first hot days of summer, a plant with damaged roots will struggle to take up enough water. This affects the health of the entire plant and can result in the browning of foliage (especially in evergreens and lawns). A weakened plant is more susceptible to pest and disease damage, and in severe cases, the entire plant may die from winter kill. Because our winters often lack consistent precipitation, many plants will benefit from supplemental winter watering.

What plants benefit from winter watering?

Nearly all plants will benefit from winter watering. However, the following plants are especially sensitive to drought injury throughout the winter.

• Recent Transplants
  • Plants that are less established have smaller root systems and need more supplemental water to thrive.
  • According to Colorado State University Extension, trees take one year to establish for each inch of trunk diameter at planting.
  • Bare root plants take longer to establish than container plants.
  • Plants transplanted later in the season take longer to establish.

• Evergreens
  • Because evergreens retain their needles, they still transpire throughout the winter. Without adequate soil moisture to replace this water loss, evergreens are at a higher risk for winter burn.
  • Evergreens at highest risk include arborvitae, boxwood, fir, Manhattan euonymus, non-native pines, Oregon grape-holly, spruce, and yew.
  • To help limit desiccation, some evergreens can be treated with a product such as Wilt Pruf® or Bonide Wilt-Stop®. Read the product label for uses and instructions.

• Deciduous Trees and Shrubs with shallow root systems
  • Woody plants with shallow root systems are more likely to dry out because they cannot pull water from deep in the ground.
  • These include alders, European white and paper birches, dogwoods, hornbeams, lindens, mountain ashes, willows and several varieties of maple including Norway, silver, red, Rocky Mountain, and hybrid maples.

• Herbaceous Perennials and Ground Covers
  • Even established perennials and ground covers can suffer from winter kill, especially those without wind protection and those with south or west exposures that experience more freezing and thawing.

• Lawns
  • Newly established lawns are especially at risk for winter kill as well as those with south or west exposures.

When should I winter water?

Most plants will benefit from winter watering from October through March.

According to Colorado State University Extension, water one to two times per month during dry periods without snow cover. Windy or sunny sites (those with south or west exposures) dry out quicker and will require more water.

Only water when air temperatures are above 40°F and the soil is not frozen or covered in snow.

Water mid-day or earlier to ensure the water has time to fully soak in before freezing at night. Test soil moisture before watering by inserting a probe or screwdriver into the soil. If the screwdriver goes in easily, watering is not necessary. However, if it is difficult to push the screwdriver in after a few inches, watering is necessary.

What is the best way to apply water during winter?

While water can be applied by hand, typically it is most efficient to water with a soaker hose, drip hose or sprinkler that attaches to a hose. (Do not use an in-ground sprinkler system as these should stay winterized until spring.)

Trees can also be watered using a deep-root fork or needle that is inserted no deeper than eight inches into the soil in multiple locations throughout the dripline and outside of it. As with watering in the summer, it is important to allow water to slowly soak into the soil. This results in deeper penetration and prevents runoff. For trees, water should penetrate to a depth of 12 inches.

How much water do my plants need?

Mulch is crucial to helping soil retain moisture. The following recommendations assume that all plants have at least two inches of mulch. Keep in mind that most sprinklers deliver approximately 2 gallons of water per minute.

Trees

• Apply at least 10 gallons of water for each diameter inch of the tree
• Water once a month (twice a month for newly planted trees)
• Water from the edge of the branches halfway to the trunk, and then two to three times that distance from the edge of the branches outward

Shrubs

• Newly Planted: Apply at least 5 gallons of water twice a month
• Small, established (less than 3 feet tall): Apply at least 3 gallons of water once a month
• Large, established (more than 6 feet tall): Apply at least 10 gallons of water once a month
• Water within the dripline and around the base

Herbaceous Perennials

• Water requirements vary based on level of establishment and size of the plant
• As a general guideline, apply half the amount of water that would be applied in a typical summer watering session once a month

Lawns

• Water lawns if there has been no precipitation for three weeks and the lawn has a south or west exposure
• Apply half the amount of water that would be applied in a typical summer watering session

Resources

https://water.unl.edu/article/lawns-gardens-landscapes/winter-watering