Saturday, September 19, 2015

Visit before the Snow Flies

Try to get out and explore some of the best Colorado public gardens and parks before the snow flies (entrance fees may apply).  Many are still at their peak showing off spectacular flower blooms, seed-heads and fall colors.  Gather ideas on plants you may want to put in next spring.

This is just a short list; there are too many wonderful places to mention! 

Aurora Municipality Center Xeriscape Garden 
Using the erroneous name “zeroscape” to describe a low-water garden consisting only of rocks and cacti is factually incorrect.  The accurate term “xeriscape,” was coined by Denver Water in the early 80’s.  It combines “xeros,” Greek for dry, with the word “landscape.”  Plants and techniques used for xeriscape landscapes are beautifully displayed and explained at this ten-acre city gem in Aurora.  

Betty Ford Alpine Gardens, Vail 
See what grows well at 8,200 feet, including the mountain perennial garden, children’s garden, alpine rock and tundra gardens, and meditation garden.  

Betty Ford Alpine Garden

View over two acres of new varieties of annuals, perennials, and fall-planted pansies.  Check their website for the “best of” winners.

Photo from CSU Flower Trial Garden Website

Denver Botanic Gardens   
There are four diverse gardens to experience. At the York Street location there are seven major plant collections on 23 acres, plus the newer Mordecai Childrens Garden.  At Chatfield Farms, a working farm in southern Jefferson County – enjoy nature trails, wildflower gardens and the Deer Creek Discovery children’s play area. DBG’s fourth garden is located at Mount Goliath, seventeen miles from Idaho Springs.  It offers awesome Rocky Mountain views and hikes, ancient bristlecone pines, plus subalpine meadows and tundra. 

Plant Select® Garden at Denver Botanic Gardens, Internet Photo

The Hudson Gardens

The Hudson Gardens and Events Center, Littleton   
Take a stroll, bring a lunch and explore – the Robert Hoffman water garden, along with the many individual gardens that feature roses, irises, herbs, dahlias, vegetables or the chocolate themed garden. Spend time at the honey bee garden and apiary and view the beehives and beneficial “insect hotels” in action. 

The Hudson Gardens

Mesa Xeriscape Demonstration Garden, Colorado Springs
Visit this low-water, sustainable landscape of plants and trees that grow well and look great in our climate. 

Mesa Xeriscape Garden in Autumn, Photo from Prairebreak

Tuesday, September 15, 2015

Take a Look

I don't know about your plant observation radar, but this time of year my antennae are up and alert.  Plants in fall bloom, water garden lilies, lotus and grasses at their glorious vertical seed-head attention give us pause to look and smile. Why?  First, they simply look stunning on sunny fall days. Plus there hasn't been any heavy moisture to topple them. The low angle light seems to give them their own spotlight, especially yellow flowers like sunflowers and black-eyed Susan (rudbeckias). I've snapped a few photos for your enjoyment. Take it all in when you can, we know what is waiting around the corner.

Fall container at our house

Robert Hoffman Water Garden at Hudson Gardens

Dahlia at Hudson Gardens 

Ruby grass or fountain grass with black-eyed Susan at Washington Park

Ferris on alyssum next to ornamental burgundy kale

Ageratums and zinnias at Washington Park

Tuesday, September 8, 2015

Japanese Beetle Blues Part III

By now adult Japanese beetles should be about gone from gardens (but not forgotten).  If pesticides were used, you've probably been picking or sweeping up dead beetles on sidewalks or driveways. Personally I don't mind seeing the corpses laying about, they did enough damage for one season. Although gone for the season, these voracious villains have procreated next year's "eating team" right in your own backyard, or your neighbor's...definitely all through the neighborhood. They are moving westward and north of central Denver, the future looks bright for them. 

One Lone, Late Season Japanese Beetle on Gaura

Mid-summer I found a new organic product for adult beetles called beetleJUS!™. It turned out to be very effective. In just a day or two after spraying I found dead beetles in the area and noticed fewer numbers on my plants. There is a grub control containing the same organic microbiol in beetleJUS!™ see below for additional information. 

To recap from my first blog - Japanese beetles have a one-year life cycle. They emerge as adults sometime in June and immediately spend their next 6-8 weeks as adults ruining your favorite plants. Females take time out from feeding to lay eggs in your grass. A garden friend told me that she had seen them actually dive bomb into the turf to deposit eggs. The adults die off in late summer, but the larvae grow and live in turf areas until next summer to start the wrath all over again. I sort of compare JBs to annual sunflowers (which we like in our gardens) where the end of the season sunflower seeds (eggs in the case of the JBs) are dropped (laid) for next summer's enjoyment (bane). 

Photo from the University of Arkansas Turfgrass Science
You can take action right now and for another few weeks (sooner is better) and use products on your turf to kill the larvae that are happily using your lawn for housing and munching on grass roots for sustenance.  If neighborhoods worked together and took action to kill the larvae each fall and for several seasons, we could make some serious dents in their populations. But that probability is about as likely as collectively ridding bindweed.  Area-wide Japanese beetle elimination has been successful however, I covered this in my first JB blog, click on the link if you missed how Palisade, CO took action - Eradicating Japanese Beetles.

Photo from
Japanese beetle larvae feeding can damage turf roots.  Since JBs are relatively new to the Denver area, perhaps their numbers aren't high enough to cause much lawn damage yet. But my hunch is that as their adult numbers build, the larvae will also increase and cause turf trouble, most noticeable in the fall.  If larvae populations are high enough, you may also see animals digging in the turf to get at the grubs - raccoons, skunks, crows and geese.  

Below is a list of larvae control options. My recommendation would be to select the most environmentally friendly product so that any beneficial insects in your garden are not negatively affected. Please choose control products wisely and consider what works best for you, your budget and time. I've compiled this list from credible, research-based websites and professionals in the green industry.  Please do your own homework beyond what is written here. 
Controls for Japanese Beetle egg/larvae in turf areas  
Bacillus thuringiensis (Bt)
Bacillus thuringiensis (Bt)
Because the adult beetles are very mobile, use of products on your lawn may have little affect in controlling the number of beetles from year to year if lawns around you are not also treated.

Biological (Organic) Controls:

1. Milky Spore (Bacillus popilliae), a bacterium that produces ‘milky disease’ in Japanese beetle grubs. (sold under the trade name St. Gabriels’ Organics Milky Spore Powder.)  Read more - Alternatives to Insecticides

2. Nematodes (small round worms that kill grubs) in the genus Heterorhabditis (e.g., Heterorhabditis bacteriophora, H. megadis).  Use as a soil drench during cool weather, must be watered in and applied when beetle larvae are present.  Read more - Insect Parasitic Nematodes 

3. Brand new to the garden market is organic GrubHALT! which is a Bacillus thuringiensis product.  Bt is a microbiol insecticide and when ingested paralyses the digestive system so the insect pest stops feeding and dies within a few days.  The newest strain is called Bacillus thuringiensis galleriae or Btg.

The upside to Btg is that it is safe to use around beneficial insects including bees, butterflies, lady beetles and people, pets and wildlife. It is also effective to use on all stages of larval growth. Other products may only work on the youngest larvae (1st-instar).  This product is not sold in garden centers - mail order from Gardens Alive. Btg is currently, as of this writing, early September 2015, getting registered in the state of Colorado. Upon approval Btg will be available from other resources, see - grubGONE!®

Use of organic products in the garden does not necessarily mean they are without unintended consequences to beneficial insects, people, pets, birds or fish. ALWAYS read the label for caution information, mixing rates and time of use. 

Chemical Controls: 
1. Chlorantraniprole - Acelypryn (commercial use only), Scotts Grub-Ex.  
2. Imidacloprid* trade names - Merit, Zenith, Criterion, also found in Bayer and Hi-Yield Products and more.  
    *Neonicotinoid (neonics) use will move to plant roots and affect blooming plants in the lawn like clover and dandelions, which are often visited by beneficial pollinators. Chlorantraniliprole, a newer product is a lower hazard to pollinators.

    Additional Resources:

    Japanese Beetles from Colorado State University
    Billbugs and White Grubs from Colorado State University
    United States Department of Agriculture Managing the Japanese Beetle: A Homeowner's Handbook