En EspaŅol

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
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
1 rating

Monday - November 05, 2007

From: SACRAMENTO, CA
Region: California
Topic: Non-Natives
Title: Cross pollination of orange and crapemyrtle
Answered by: Barbara Medford

QUESTION:

I have a crapemyrtle tree growing 3 feet from a navel orange tree. This summer a shoot grew from the ground 5 inches from the orange tree. The shoot looks just like the orange tree but the leaves were identical to the leaves of the crapemyrtle. The shoot produced a small (about the size of a keylime) fuzzy "orange" which ripened in September (oranges are ready in December here). The leaves of the orange tree remain on the tree year round but the leaves of the shoot have dropped off like the crepe myrtle does this time of year. Is it possible for these two trees to cross pollinate?

ANSWER:

First of all, the Lady Bird Johnson Wildflower Center is centered on the care, protection and propagation of plants native to North America. While the Malpighia glabra (wild crapemyrtle) is native, it appears naturally only in Texas.

The crapemyrtles distributed commercially and grown in Zones 6 to 9 are all natives of Asia. In recent years, the Japanese crapemyrtle has been becoming more popular in the U.S., extensively hybridized both for variations in color and form, and also in an attempt to limit damage from mildew. Crapemyrtles are members of the family Lythraceae and genus Lagerstroemia.

Orange trees, family Rutaceae and genus Citrus, are native to Vietnam, Southern China and Northwest India. They were brought to the New World early, and in 1820, a single mutation appeared in an orchard of sweet orange in a monastery in Brazil, producing the navel orange.  Because the mutation left the fruit seedless and therefore sterile, the only means available to cultivate more of this variety is to graft cuttings onto other varieties of citrus trees.

So, even though we are talking non-natives, Mr. Smarty Plants couldn't resist possibly being part of the discovery of a whole new plant. Alas, it was not to be. Cross pollination usually only occurs between plants of the same or closely related species (not between Lagerstroemia and Citrus); foreign pollen landing on a receiving blossom is incapable of delivering that pollen. It is believed that a flower obtains clues to the alien pollen's incompatibility from the grain's shape and chemical composition.

So, how about another mutation, you say? Slightly possible, but way out of our line. We are guessing that a bird (birds are great little gardeners) ate a nice seed somewhere maybe miles from your yard. He continued his seed gathering while the seed worked its way through his digestive system. Then, he stopped to perch on your lovely orange tree, and deposited the seed with a little fertilizer added (no charge).

If you would like to know what the plant is that came up, Mr. Smarty Plants loves to identify plants. However, it is very difficult to do from a description. The fuzzy little "keylime" that emerged sounds like a seed pod. If you got some pictures before the leaves dropped off and could send one to us, we might be able to identify it. There are instructions for sending pictures on the lower right hand side of the "Mr. Smarty Plants" page.

 

More Non-Natives Questions

Wintering non-native liriope spicata indoors in Chillicothe IL
November 08, 2013 - I live in zone 5, zip 62523, wintering liriope spicata starter plants in basement, ambient consistent. Do I need grow lamps or is the plant satisfied being dormant as long as I do not let it dry out? ...
view the full question and answer

Prairie remnant threatened by non-native Queen Anne's lace in Dallas
June 09, 2010 - A blackland prairie remnant is being invaded by Queen Ann's Lace. What are the best, least chemical, methods of getting rid of it without damaging the native grasses and wildflowers? Thank you!
view the full question and answer

Native climbing rose for Austin
April 25, 2010 - Is there such a thing as a native climbing rose that would do well in Austin?
view the full question and answer

Non-native crape myrtle resistance to deer from Annapolis MD
April 06, 2013 - Is Crape Myrtle tree resistant to deers? Thank you.
view the full question and answer

Non-native Boulevard Cypress Pom Pom trees in Princeton NJ
October 29, 2011 - I just had some landscaping done near my front door and front yard. I have two Boulevard Cypress B&B (4-5') Pom Pom. The pom poms are turning brown. What should I have been doing? I am watering them ...
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 | SITEMAP | STAFF
© 2016 Lady Bird Johnson Wildflower Center