Rent Shop Volunteer Join

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

Please forgive us, but Mr. Smarty Plants has been overwhelmed by a flood of mail and must take a break for awhile to catch up. We hope to be accepting new questions again soon. Thank you!

Need help with plant identification, visit the plant identification page.

 
rate this answer
1 rating

Saturday - July 27, 2013

From: Austin, TX
Region: Southwest
Topic: Container Gardens, Cacti and Succulents, Grasses or Grass-like, Herbs/Forbs, Shrubs
Title: Plants for hanging flower boxes from Austin
Answered by: Barbara Medford

QUESTION:

I have two long flower boxes 17" x 15" x 25 feet long one on the north side of the apt and one on the south made of metal suspended about four feet from the ground. One will get the morning sun and the other won't however they both will get hot sun/ no shade most of the day. I would like a drought resistant plant that won't freeze and maybe drape out of the boxes but if that isn't possible just some succulents. These plants do not have to have flowers. I plan to collect water and set up a drip system for them.

ANSWER:

We are having a little trouble envisioning these "hanging gardens,"  but will try to help you as much as we can. Basically, what you are telling us is that you are planning very large container gardens suspended in metal troughs in mid-air. Probably the best place to start is with some help with container gardening. Please follow these two links:

How-to Article Container Gardening with Native Plants

Video presentation on how to plant in containers from the Wildflower Center.

Since you have stated that these are metal and will be in full sun (in Austin) a lot of the day, you will need to select very heat tolerant plants. The fact that the boxes are of metal means even more heat stress. And, in the Winter, there will still be concerns because the roots of the plants will be encased in a thin skin of metal and a few inches of potting soil, with cold air on all sides. The root of a plant is the most susceptible to cold. From Clemson University Cooperative Extension, here is an article on Cold Damage. Also, a previous Mr. Smarty Plants answer on the insulation the earth provides. This is from a colder hardiness zone, but it illustrates a problem you may find yourself dealing with. We realize we are spending a lot of time on heat/cold issues, but we hope it will help you realize that you are presenting us with a real challenge in terms of the environment these plants will have to endure.

Now, having hopefully covered ourselves if you have plant failures, we will fulfill your original request. For plant sources, we are going to to our Recommended Species for Central Texas list.  Please note this paragraph at the beginning of that list:

"Texas-Central Recommended

Commercially available native plant species suitable for planned landscapes in Central Texas. Visit our Suppliers Directory to locate businesses that sell native plants or seeds or provide professional landscape or consulting services in this state. Visit the Organizations Directory to locate native plant societies, conservation groups, governmental agencies, botanical gardens, arboreta, and other plant-related organizations in this state."

This list has 157 choices, all recommended for Central Texas, which means they should be heat tolerant in Austin. Cold tolerance is a whole other thing. Using the selection list on the right-hand side of that page, we will select on "moist" for soil moisture, since you say you are preparing drip irrigation, but you need to be aware that most succulents need very good  drainage and will do better with some sand or degenerated granite or limestone in their soils. For Height Range we will select 1 to 3 ft., but if you want to try for taller plants, you may run the same search and select 3 to 6 ft. For Light Requirement, "sun." You can follow each plant link to our webpage on that plant to learn what its growing conditions are, what soils it prefers, when it blooms and what color, etc. We will run separate searches for each Habit. Please note that many plants on the Central Texas list really prefer dry soil, so you may find yourself rethinking the drip irrigation. We chose 15 plants of various Habits, but only have room for 12 pictures; be sure to read each webpage on that plant where you can learn more about it, and see additional pictures.

Herbs (herbaceous blooming plants):

Asclepias tuberosa (Butterflyweed)

Callirhoe pedata (Finger poppy-mallow)

Conoclinium coelestinum (Blue mistflower)

Monarda fistulosa (Wild bergamot)

Dichondra argentea (Silver ponyfoot)

Salvia coccinea (Scarlet sage)

Grass or Grass-like:

Bouteloua curtipendula (Sideoats grama)

Muhlenbergia reverchonii (Seep muhly)

Succulents:

Hesperaloe parviflora (Red yucca)

Yucca rupicola (Twistleaf yucca)

Yucca thompsoniana (Thompson's yucca)

Shrub:

Chrysactinia mexicana (Damianita)

Dalea frutescens (Black dalea)

Penstemon baccharifolius (Rock penstemon)

Salvia greggii (Autumn sage)

 

From the Image Gallery


Butterflyweed
Asclepias tuberosa

Palmleaf poppymallow
Callirhoe pedata

Blue mistflower
Conoclinium coelestinum

Sideoats grama
Bouteloua curtipendula

Seep muhly
Muhlenbergia reverchonii

Red yucca
Hesperaloe parviflora

Twistleaf yucca
Yucca rupicola

Thompson's yucca
Yucca thompsoniana

Damianita
Chrysactinia mexicana

Black dalea
Dalea frutescens

Rock penstemon
Penstemon baccharifolius

Autumn sage
Salvia greggii

More Herbs/Forbs Questions

Low plants to cover bank too steep to mow
June 26, 2008 - I have a bank along the road that is too steep to mow. This bank faces east and only gets 2 - 4 hours per day of sunlight. I'd like to try ground cover to prevent erosion, however visibility is a p...
view the full question and answer

Annual plants for weed control in Pflugerville,TX?
September 14, 2010 - Can you suggest an annual or summer-dormant plant to mix with Dalea frutescens? The object is to discourage the spring-emerging weeds that precede the leafing out of the Dalea, so it should finish bl...
view the full question and answer

Native plants of Taos and Los Alamos NM from Houston
April 07, 2012 - Hi, Mr. Smarty Plants, can you recommend a guidebook for the native plants of the Taos/Los Alamos region? (I'm most interested in forbs.) I'll be headed there in May--is there anything I should es...
view the full question and answer

Negative and positive effects of invasive dandelions from Rama Ontario
January 12, 2012 - How do Dandelions have a negative impact of being a invasive and a Positive impact of being a invasive species ?
view the full question and answer

Invasiveness of Cosmos from Decatur GA
April 26, 2013 - I have been searching for an answer concerning the invasive plant Cosmos. I know that Florida declares this but I have not been able to find out does Georgia? And specifically,is it only the yellow Co...
view the full question and answer

Support the Wildflower Center by Donating Online or Becoming a Member today.