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
Not Yet Rated

Wednesday - June 27, 2012

From: New Carrollton, MD
Region: Mid-Atlantic
Topic: Erosion Control, Groundcovers, Grasses or Grass-like, Herbs/Forbs, Shrubs, Trees, Vines
Title: Plantings for a slope from New Carrollton MD
Answered by: Barbara Medford

QUESTION:

My house (Maryland, near DC) sits at the bottom of a south facing slope. The soil is very heavy clay. The grade is about 1:20 for about 100 feet (with a steeper part at the top). Part of the hill is in direct sun but most is part-shade. What native shrubs, trees and perennials can I plant that would have high wildlife value and control erosion? I don't want grasses because then I would have to mow them (no grasses higher than 8 inches allowed, even in meadows). Thanks very much in advance!!

ANSWER:

First, read our How-To Article on Gardening with Native Plants. Next, since you specified high wildlife value, read our How-To Articles on Wildlife Gardening and Butterfly Gardening. We are not civil engineers so the slope values are a foreign language. You would have to make your own decisions on whether a tree would tolerate being planted on a sloped surface. Since we recommend only plants native not only to North America but to those areas where the plant grows naturally, we will go to our Native Plant Database and, using the parameters you have given us of sun (6 hours or more of sun a day) and part shade (2 to 6 hours), native to Maryland in the various habits (shrub, tree, herbaceous blooming perennials) and give you some examples for each. Once you have become acquainted with our Native Plant Database, you will be able to make your own selections. Follow each plant link on our list to determine the growing conditions for that plant, light, water needs, etc. before making a decision.

We would suggest that you first map out the sunny and/or part shade areas of your plot, watching it for a few days and noting the times on your map to make choices more relevant to the space. The clay soil is going to be a problem, and we recommend that you amend any area where you are planting with a good quality organic compost to assist in drainage and to allow the new young rootlets air space in the soil in which to extend. We regret that you have ruled out grasses, as they are the very best plants for controlling erosion, with their long fibrous roots. Just in case, we are going to recommend a couple of grasses that  would not be mowed  but are ornamental. We will also throw in a vine that might go at the top of the steeper slope and trail down and some low groundcovers.

So, we will begin with herbaceous blooming plant (herbs). First round, we will go to our Native Plant Database, select on Maryland, herbs for Habit, both sun and partial shade for Light Requirements. There are other specifications you can put in such as expected height, bloom color and time or soil moisture, but we can only use the conditions you listed. One last bit of advice, Summer is not a good time to be planting, especially the woody plants, trees and shrubs.

Herbaceous blooming plants - Asclepias tuberosa (Butterflyweed) and Capsicum annuum (Chile pequin)

Shrubs - Callicarpa americana (American beautyberry) and Comptonia peregrina (Sweet fern)

Trees - Amelanchier laevis (Allegheny service-berry) and Cercis canadensis (Eastern redbud)

Grasses - Chasmanthium latifolium (Inland sea oats) and Muhlenbergia capillaris (Gulf muhly)

Vines - Bignonia capreolata (Crossvine) and Passiflora incarnata (Purple passionflower)

Low groundcover - Antennaria plantaginifolia (Plantain-leaf pussytoes) and Cornus canadensis (Bunchberry dogwood)

 

From the Image Gallery


Butterflyweed
Asclepias tuberosa

Chile pequin
Capsicum annuum

American beautyberry
Callicarpa americana

Sweet fern
Comptonia peregrina

Allegheny serviceberry
Amelanchier laevis

Eastern redbud
Cercis canadensis

Inland sea oats
Chasmanthium latifolium

Gulf muhly
Muhlenbergia capillaris

Crossvine
Bignonia capreolata



Plantain-leaf pussytoes
Antennaria plantaginifolia

Bunchberry dogwood
Cornus canadensis

More Herbs/Forbs Questions

Native plants for flower beds in Aledo, TX
March 10, 2009 - I have 2 beds that together run the length of the house foundation (25' each), we have 2 spots I would like to plant a Yaupon (Pride of Houston) in each spot approximately 2' from the foundation;is ...
view the full question and answer

Interested in a mini food forest
February 04, 2013 - I am interested in starting a mini "food forest" in a twelve foot by twelve foot patch of earth next to my house. I'd like to put a focus on making sure that the bulk of the plants I introduce are ...
view the full question and answer

Source for dotted blue-eyed grass from Saluda SC
February 23, 2013 - I lived in Texas for several years and now live on acreage in South Carolina. I have heard that bluebonnets don't grow well in South Carolina. However, there is a place by the road near our house t...
view the full question and answer

Horsetail Rush invasive in Santa Monica CA
January 16, 2012 - Mr. Smarty Plants: I live about 3 miles from the beach in the Santa Monica area and have an 18inch deep planter area in my backyard that is adjacent to my garage. I like the look of horsetail rush. I...
view the full question and answer

Butterflies attracted by Pink Evening Primrose from Burnet TX
July 30, 2012 - I see information on Pink Evening Primrose that says it attracts 'many butterflies' Please tell me which butterflies and name them? I've looked everywhere and am just exhausted and frustrated with...
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