En Español

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
Not Yet Rated

Friday - August 11, 2006

From: Caribou, ME
Region: Northeast
Topic: Non-Natives
Title: Alternatives to non-native, invasive Pampa grass
Answered by: Joe Marcus

QUESTION:

Could you please tell me if Cortaderia Selloana is "zone 4" hardy? Also how to start Opuntia Humifusa from cuttings? Do I let them stand upright dry and with no soil until they form the callous? Please help! Thank You So Much! Janet

ANSWER:

Most references give USDA cold-hardiness zones 6 or 7 as the northern limit for Cortaderia selloana, Pampas grass. It might survive in your area if located in a protected spot, but it might be just as well for you if it won't. Many people who plant this South American native in their gardens end up regretting doing so because of its legendary aggressiveness - it tends to resist all efforts to control its relentless expansion.

You might consider some native alternatives which would be perfectly suited to your climate and are much less likely to cause headaches later on. Some possibilities are Switchgrass, Panicum virgatum; Indiangrass, Sorghastrum nutans and Canada wild rye, Elymus canadensis. All are stately grasses native to Maine.

The cactus you are asking about, Opuntia humifusa, Eastern prickly-pear is not native to your area either, and will likely need winter protection. They are easy to propagate, though. Just let the wound caused by seperating the pads dry for a few days and then insert the severed end in evenly moist, well-drained media. It should root within a few weeks. Here is a link to a great web page on cactus propagation which goes into more detail.
 

More Non-Natives Questions

Information about ice plant (Carpobrotus edulis)
May 06, 2008 - I recently planted some Carpobrotus edulis, Ice plant, and wanted to know if I can mulch or put stones around the entire garden and plants. They are a ground cover plant.
view the full question and answer

Care of non-native, hybrid petunias
August 31, 2004 - I have a beautiful Petunia Tiny Tunia Violet plant which has been flowering nicely (in sun and shade environment). Suddenly, a few days ago, it began to look like it's dying--stalks all dried out. Is...
view the full question and answer

Planting distance for non-native crepe myrtles in San Antonio
June 23, 2009 - I just purchased 7 katawba crepe myrtles and would like to know how far apart I need to space them. I am placing down on the right side of my front yard. They are in 5 gallon containers and about 5 - ...
view the full question and answer

Is India Hawthorne a deer-resistant plant?
July 03, 2011 - Is India Hawthorne a deer resistant plant in Beaufort County South Carolina?
view the full question and answer

Non-native vines poisonous from Bakersfield CA
May 17, 2013 - Are pink bower vines and stars and stripes mandevilla toxic to dogs?
view the full question and answer

Support the Wildflower Center by Donating Online or Becoming a Member today.
E-NEWSLETTER | BECOME A MEMBER | DONATE NOW | MEDIA | JOBS | SITEMAP | STAFF INTRANET
© 2016 Lady Bird Johnson Wildflower Center