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
6 ratings

Thursday - August 07, 2008

From: Philadelphia, PA
Region: Mid-Atlantic
Topic: Shrubs
Title: Identification of shrub with thorns
Answered by: Nan Hampton

QUESTION:

I have a plant in my garden that I need to identify. It is a tall shrub (approx. 10 feet) that has very large thorns on its green branches. It is now showing small white flowers. I don't know if it looses its leaves (groups of 3 leaves together) over the winter as this is a new property for me. The thorns on this plant are approx. 1-2 inches long and cover the entire plant. Any ideas what this might be? I've never seen anything like it. A neighbor told me she thought it was called "Crown of Thorns" or that it might be something in the orange fruit family. Please help!

ANSWER:

Euphorbia milii (crown-of-thorns) is a native of Madagascar and does have lots of thorns on its stems but it only grows to about 3 feet high. Also, I doubt it would survive Pennsylvania winters since it is hardy to USDA Hardiness Zones 8 to 11 and Pennsylvania Hardiness Zones are mainly 5 and 6.

Here are possibilities for native Pennsylvania shrubs with thorns:

Crataegus phaenopyrum (Washinton hawthorn) 

Crataegus flava (yellowleaf howthorne) 

If none of these happens to be your shrub, please send us photos and we will do our best to identify it.  Please take photos of the whole plant and closeups of the thorns and of the leaves.  Visit the Ask Mr. Smarty Plants page to read instructions (under "Plant Identification" for submitting photos. 

 

 

More Shrubs Questions

A privacy hedge for a shady spot in Austin, TX
July 02, 2012 - What is a good choice for a privacy hedge in west Austin in a predominantly shady area? I'd like it to be 8-12 feet, along the fence, so as to obstruct the view of the neighbor's yard.
view the full question and answer

Rocky Stream Bank Plants for Dallas, TX
July 02, 2015 - Need live stake shrubbery or tree ideas for a rocky stream bank prone to high water. Thank you
view the full question and answer

Shrub Recommendation for Chain Link Fence in DE
January 26, 2016 - What shrub would you recommend for covering a chain link fence and providing a screen between mine & my neighbors yard? They have kids, so it would have to be non-toxic. I'd like flowers/berries for ...
view the full question and answer

Plants that smell like chocolate from Coral Gables FL
July 12, 2012 - I am looking for plants that smell like chocolate. I live in south Florida. We are currently growing and testing Berlandiera lyrata. Do you know of other plants whose flowers smell like chocolate?
view the full question and answer

How to Control Poison Ivy
February 22, 2016 - We have lots of Poison Ivy on a site we are clearing it is adjacent to a pond and children are around this area all the time. We are creating hiking paths. I have a lot of experience but I do not wan...
view the full question and answer

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