En EspaŅol

Q. Who is Mr. Smarty Plants?

A: There are those who suspect Wildflower Center volunteers are the culpable and capable culprits. Yet, others think staff members play some, albeit small, role. You can torture us with your plant questions, but we will never reveal the Green Guru's secret identity.

Help us grow by giving to the Plant Database Fund or by becoming a member

Did you know you can access the Native Plant Information Network with your web-enabled smartphone?

Share

Ask Mr. Smarty Plants

Ask Mr. Smarty Plants is a free service provided by the staff and volunteers at the Lady Bird Johnson Wildflower Center.

Search Smarty Plants
    
 
See a list of all Smarty Plants questions
Can't find the answer in our existing FAQs, submit a question to Mr. Smarty Plants.
Need help with plant identification, visit the plant identification page.
 
rate this answer
12 ratings

Wednesday - March 17, 2010

From: Little Chute, WI
Region: Midwest
Topic: Shrubs
Title: Native trees or shrubs for containers on roof in Wisconsin
Answered by: Nan Hampton

QUESTION:

Looking for native trees/shrubs to be planted in containers on a flat roof w/south-southeast exposure. Gets pretty warm in the summer and pretty cold in the winter. How big would the container have to be?

ANSWER:

First, let me refer you to our article, Container Gardening with Native Plants.  You will see in the article that the recommendation for the size of the pot is: 

"Select a container that will accommodate the full sizes of the plants it will house. It should provide ample root space and have a substantial base to offset top-heaviness (both visually and in terms of stability)."

Winter weather in Wisconsin, however, presents an addtional consideration for the size of the pot you can use.  I believe you can handle the summer heat as long as you pick plants that are happy growing in full sun and you give them adequate water.  However, the winters are another matter.  Roots in a container will not have the same protection from freezing that roots buried in the ground will have.  With container plants you will need to move them to a protected environment to protect their roots as the winter temperatures drop well below freezing.  Consequently, you will need to select plants that fit into containers that you will be able to move to a protected place. You can read advice on preparing container plants for winter weather in the article, Maintaining Winter Gardens in Gladwin, MI, from the National Gardening Association.

Below are shrubs that are Wisconsin natives that grow in full sun.  If the your area is in shade (less than 2 hours sun per day) or part shade (2 to 6 hours of sun per day), you can find recommendations for other plants in our Wisconsin Recommended list.  You can use the NARROW YOUR SEARCH option to limit the list to only 'Shrubs' by choosing that selection under GENERAL APPEARANCE.

Actaea rubra (red baneberry)

Amorpha fruticosa (desert false indigo)

Cornus racemosa (gray dogwood)

Dasiphora fruticosa ssp. floribunda (shrubby cinquefoil)

Physocarpus opulifolius (common ninebark)

Symphoricarpos albus (common snowberry)

Shepherdia canadensis (russet buffaloberry)

Yucca filamentosa (Adam's needle) and here is more information.

Here are photos of the above plants from our Image Gallery:


Actaea rubra

Amorpha fruticosa

Cornus racemosa

Dasiphora fruticosa ssp. floribunda

Physocarpus opulifolius

Symphoricarpos albus

Shepherdia canadensis

Yucca filamentosa

 


 

 

More Shrubs Questions

Evergreen thorny bush for California
May 01, 2010 - I need to find an evergreen thorny type bush, shrub or tree that will grow with about 3-4 hours of morning sun only. Prefer CA native, inland/semi coastal. Purpose: To provide a deterrent for "tag...
view the full question and answer

Chlorosis in yaupon from San Angelo TX
April 08, 2012 - Thank you for your information on the yaupon holly. We just finished clearing out the mulch and the red ground cover that popped up. I will quit watering it as much as the rest of the plants. Our y...
view the full question and answer

Native plants for city lot in Longview, TX
March 19, 2008 - Just bought a city lot in Longview, TX and want to put in some plants at the periphery even before the house is built. Can you recommend any that would be from your list of East TX plants that are pa...
view the full question and answer

Problems with non-native photinia in Austin
October 07, 2013 - Hi, I live in Cedar Park, TX (Austin Suburb)and have planted a number of Photinia shrubs in various areas of my property. All about 10 months old. The leaves are curling along their length on many...
view the full question and answer

Failure of highbush blueberry plant to produce in New Hampshire
July 25, 2008 - One of my highbush blueberry plants completely stopped producing. What can I do to revive it?
view the full question and answer

Smarty Plants's Facebook profile Support the Wildflower Center by Donating Online or Becoming a Member today.

Mr. Smarty Plants wants you to be his Facebook friend. Click the Facebook icon to add yourself to Mr. Smarty Plants list of friends.
E-NEWSLETTER | BECOME A MEMBER | DONATE NOW | MEDIA | SITEMAP
© 2014 Lady Bird Johnson Wildflower Center