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

Best time to plant non-native Crape Myrtle in Fulshear TX
July 01, 2010 - When are the best times to plant Crape Myrtles? My husband and I have just moved to Fulshear, TX (just slightly west of Houston) and being summer, I didn't think this was the best planting period. ...
view the full question and answer

Plants not native to North America in Hawaii
February 18, 2009 - Do not know if you have any experience for Hawaii but here it goes. I live on Maui and have some coco palms, a line of 12, two of them right next to each other (15-20 ft). They are a decent shade of ...
view the full question and answer

Powdery growth in hydrangea in Philadelphia
June 20, 2010 - My hydrangea plants have a weird growth on their leaves that looks like white rice. It looks like it would be powdery if brushed, but I don't want to touch it for fear that it some type of mold. Any...
view the full question and answer

Care of Passiflora incarnata or Passiflora coccinea
July 04, 2007 - Hi- I have two passionflowers, one red, one purple. I live in upstate NY. They grow very well up onto trellises, however, they have stopped producing flowers. Both are planted in pots (fairly large)...
view the full question and answer

Gaura dying from Townsville, Australia
September 14, 2012 - My passionate pink Gaura appears to be dying. It had a beautiful blooming period & now is going backwards. What is happening? I have pruned it, but don't know how to save it.
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