En EspaŅol
Share

Ask Mr. Smarty Plants

Mr. Smarty Plants - Identification of shrub with thorns

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
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

Propagation of poinsettias in water from Houston
September 06, 2013 - Pointsettias - we have a broken branch that is thriving in a jar of water with new leaves and additional small branches. When we plant the stem in dirt and even a muck, the growth starts to wither. ...
view the full question and answer

Leaves on yaupon holly turning brown/black
July 20, 2011 - Arlington TX Yaupon Holly has leaves on stems closer to the bottom of the plant and moving up that are turning brown/black. Is this a disease, over/under watering? There is black gummy soil, but it ha...
view the full question and answer

Brown leaves on possumhaw holly in Grandview TX
July 02, 2009 - What would be likely causes for brown leaves on possumhaw holly? We have 2, one was planted in spring 2008, and a slightly larger one planted late winter/early spring this year. Most of the leaves a...
view the full question and answer

Why won't my Jacaranda flower in Oviedo, FL?
October 06, 2010 - I have a Jacaranda tree that is 12 years old and and nearly 30 feet tall. It is a beautiful healthy tree that has never produced flowers. How can I get my tree to bloom? Thank you
view the full question and answer

Identification of a shrub in San Marcos, TX
May 20, 2013 - On a walk in Austin's Barton Creek greenbelt, a Treefolks volunteer identified a shrub that I also have on my property in San Marcos as blue candalia. However I can't find a plant by that name via w...
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