En EspaŅol
Share

Ask Mr. Smarty Plants

Mr. Smarty Plants - Zucchini blooms but no fruit

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
9 ratings

Tuesday - August 26, 2008

From: Blackstone, MA
Region: Northeast
Topic: Non-Natives, Pollinators
Title: Zucchini blooms but no fruit
Answered by: Nan Hampton

QUESTION:

My zuchinni has lots of flowers, but they seem to fall and I am getting no fruit.. WHY

ANSWER:

First of all, squash plants are monoecious (male and female reproductive parts on the same plant but in separate flowers).  The male flowers tend to occur near the center of the plant and the female flowers usually occur nearer the outside.  You can see in the photograph that the female flower has a swelling at the bottom, the ovary, that will become the squash fruit if it is pollinated.  The male flowers tend to appear and open earlier than (sometimes several days before) the female flowers.  They open early in the morning and then die and fall off.  More male blossoms will replace them and female flowers will also eventually bloom.  In order for there to be a fruit, the female flower has to be pollinated by the pollen from a male flower.  This is normally accomplished by an insect first visiting a male flower for its nectar, collecting pollen on its body, and then visiting the female flower for its nectar and shedding the pollen on the pistil of the female flower.  So, your lack of fruit may be that: 1) all the flowers so far have been male flowers and you should soon get female flowers as well; or 2) the pollinator population in your area is reduced (see the information on honeybee decline).  If you see that your plant has both male and female flowers but you're still not getting fruit, you can assume that for some reason your female flowers are not getting pollinated.  You can do the pollinating yourself by taking a small artist's brush and collecting pollen from the stamens of male blossoms and then brushing it onto the pistils of female flowers.  Brushing the pistils with pollen from several male flowers should do the trick.

 

More Non-Natives Questions

Non-native Mandevilla care
March 08, 2006 - I have a mandevilla and it looks like there are about 5 plants in one pot. Can it be separated without killing it? And, if it can be separated how should it be done? The plant is about 7" high and i...
view the full question and answer

Consumption of carbon dioxide from South Korea
December 07, 2011 - I am curious about what flowers consume CO2 for growing (especially 1-year life flower). Thanks.
view the full question and answer

Freeze damage to non-native Alocasia portei in Alice, TX
February 15, 2010 - Alocasia portei family (I think). I have a palm type plant with finger-like broad leaves that grows its "palm like leaves" at the end of a curving trunk. These leave I trim back as new ones grow in...
view the full question and answer

Plant identification for shrub in Florida
September 03, 2011 - On our street we have ornamental shrub planted in the median that has small waxy green leaves, produces small fragrant white flowers, and red berries with white pulp and small seeds on the inside. Th...
view the full question and answer

Replacements for photinia from San Antonio
August 31, 2012 - i just read your response to someone regarding Red Tip shrubs. You just saved me thousands of dollars ! I was getting ready to order over 250 of these to line my 2.5 acre fence line. What shrub would ...
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