En EspaŅol
Share

Ask Mr. Smarty Plants

Mr. Smarty Plants - Stick with tried and true plants for a green roof in New York

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
Not Yet Rated

Sunday - May 12, 2013

From: New York, NY
Region: Northeast
Topic: Wildflower Center, Green Roofs, Herbs/Forbs
Title: Stick with tried and true plants for a green roof in New York
Answered by: Leslie Uppinghouse

QUESTION:

If I use Virginia creepers in a ground covered application for a green roof, how much soil should I provide depth wise?

ANSWER:

Parthenocissus quinquefolia (Virginia creeper) isn't the best ground cover in a green roof application. A good rule of thumb would be to stay away from any woody plant. Plants which age into a woody stem you can count on preferring deeper soil and although Virginia creeper will grow as a ground cover through loose leaf mulch the tap root of this plant will dive down as deep as it can go. It might work for a bit, but long term, it would be unhappy. 

Depending on your construction, you would typically be looking for no less than four inches of soil but rarely would you be able to do much more than that so you need to think about plants that have a shallow root system and you also typically need to focus on plants that can take full sun and full exposure to the elements. You also may be dealing with a slope of some kind so keep that in mind as well and look for plants that can hold what little soil is available to them, in place. This is why bunch grasses and sedges are used so frequently. If grasses seems too plain, don't despair, many smaller plants both perennial and reseeding annuals will liven the space up with texture and color. 

Green roofs provide many benefits but are tricky to install and maintain. Take plenty of time researching both the construction as well as the plants and soil you will be using. As the popularity of these systems rise so has the availability of information. We at the Lady Bird Johnson Wildflower Center have been working on green roof systems for many years under the guidance and direction of Dr Mark Simmons. Take a look at this information from the green roof page of our web site which tells you a little bit about the work we have done at the Center. It also has some links included that might give you some ideas. 

As you are in New York also take a look at the City of New York Parks and Recreation web site, it has a nice list of plants that they recommend for green roof applications with native plant recommendations for your area.  Some of the plants included in this list are: Tridens flavus (Purpletop tridens)Andropogon virginicus (Broomsedge bluestem)Geum canadense (White avens)Pycnanthemum virginianum (Virginia mountain mint)Symphyotrichum laeve (Smooth blue aster)

 

 

From the Image Gallery


White avens
Geum canadense

Purpletop tridens
Tridens flavus

Virginia mountain mint
Pycnanthemum virginianum

Smooth blue aster
Symphyotrichum laeve

Broomsedge bluestem
Andropogon virginicus

More Herbs/Forbs Questions

What to do with 200 yucca seedlings in Sandusky, OH?
August 31, 2013 - I have over two hundred 3 month old yucca seedlings from my last yr. Yucca plants. I soaked the the seeds for 24 hrs. planted them in trays and now they are abt. 2 inch tall. My question is, should I ...
view the full question and answer

Something eating cannas in Austin
July 14, 2012 - What is eating my cannas?
view the full question and answer

Pink wildflowers on DFW runways in April-June
October 10, 2013 - I fly thru DFW quite often and have noticed in April-June timeframe the runways are dotted with a light pink colored wildflower. Have asked the DFW Customer Service folks for the name, ones I've ask...
view the full question and answer

Propagation of Asclepias tuberosa
June 18, 2012 - Re: Asclepias tuberosa, "butterfly weed" bush -- I have a bed in a mix of Shoal Creek well-drained caliche, soil, and some enrichment of mulch that gets almost full sun and low water. After 4 yrs a...
view the full question and answer

Plants for under non-native fruitless mullberry trees from Ft. Worth TX
June 28, 2012 - I live in Tarrant county, where summer droughts are the norm. I have a 150x50 foot swathe of mature "fruitless mulberry" trees, which create a very shady atmosphere. The soil is clay dominated, ro...
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