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

Privacy screen from Temecula CA
May 04, 2013 - I live in Temecula and need a fast growing tree by our pool that is good to block neighbors house.
view the full question and answer

Needs Help with Peonies
January 14, 2011 - With the clay soil in North Texas (Frisco) which variety of peony would thrive and become a reliable bloomer? I do work on amending the soil with expanded shell and compost, but ultimately, we still h...
view the full question and answer

When is the best time to transplant Esperanza bushe in Buda, TX?
September 04, 2013 - When is the best time to transplant an Esperanza bush? I want to move it because it is overwhelming my front yard. Thank you,
view the full question and answer

Dog-proof shrubs in Woodmere NY
May 21, 2009 - My chocolate lab thinks that shrubs are the same as "fetch" sticks..she's ripped out my azalea, rhododendron, andromeda and a few others I'm not sure of the names. She's a great pup (almost 1 yr...
view the full question and answer

Selection of a small variety of Desert Willow for SE Texas
August 02, 2011 - Looking to plant desert willow as shrub. Any helpful tips to keep height down and plant full or bushy.
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 | STAFF
© 2015 Lady Bird Johnson Wildflower Center