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

Time to cut back Turk's Cap in Austin
January 27, 2011 - I did not find my question answered in the database. My question is: When is the best time to cut back Red Turks Cap? I live in Central Austin.
view the full question and answer

Non-native astilbe resemblance to non-native poisonous castor bean from Tomslake BC
May 21, 2014 - I have a plant that looks like a castor bean but it has flowers like a Younique Silvery Pink Astilbe. Need to id because castor bean is poisonous. This plant grows up to 5 feet in height. Thank you !
view the full question and answer

Trees for clay soil from Charlotte TX
August 25, 2013 - We have an area in our yard that even Esperanzas won't grow. It is near another that does great. Six Esperanzas are planted in a north/south row about with 10' between plants, the southern most plan...
view the full question and answer

Non-native Philadelphus Innocence mock orange from Paris TX
June 20, 2012 - What is the best place in the garden to grow Philadelphus Innocence mock orange in Paris, Tx? Also, how long after transplanting do flowers occur? Any tips appreciated
view the full question and answer

Rhododendrons Hydrangeas in Indiana
December 13, 2007 - I live in very southern Indiana. Our home faces west and at the front of our home I have planted three rhododendrons. The furthest south is growing well the two to the north not so well. All three h...
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