Native Plants
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.
Did you know you can access the Native Plant Information Network with your web-enabled smartphone?
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.
rate this answer
Monday - April 06, 2009
From: Plano, TX
Region: Southwest
Topic: General Botany
Title: Will molasses harm beneficial organisms in my garden?
Answered by: Nina Hawkins
QUESTION:
If I use molasses in the garden, I am hoping this will NOT kill the beneficial nematodes and my earth worms, or other good bugs such as lady bugs? Thanks.ANSWER:
Boy, your seemingly simple question sure turned out to be a doozy to research! I am not a soil biologist, so please bear in mind that this is not the answer of an expert, but rather that of a gardener searching for reliable information - just like you! The short answer is no, using molasses as a soil amendment or foliar spray in your garden should not harm any beneficial organisms living in your garden. Molasses (both liquid and granular) is a widely accepted organic soil amendment that is used to promote biological activity in the soil by providing a readily available source of food (carbohydrates) to microbes already living in the soil. One of your local organic gardening experts, Howard Garrett, also recommends spraying a molasses mixture onto garden plants before releasing beneficial insects (lady bugs, green lacewings and trichogramma wasps) to encourage them to stay in your garden and claims that molasses used in the garden repels fire ants. Maryanne Caruthers-Akin, another organic gardening expert out of Portland, OR, uses molasses in her garden beds to attract earthworms - so no harm there. The Hawaii Agriculture Resource Center says that molasses soil amendments affect the "soil microbial ecology, usually resulting in lowered populations of plant parasitic nematodes as well as having other favorable effects on plant growth. The specific mechanisms are not well understood and vary with the crop, soil conditions, and nematode species present." (Links are listed below.) I have been completely unable to find any information claiming that the use of molasses will harm beneficial nematodes and it is uncertain just how molasses works to discourage "bad" nematodes. Perhaps healthier plants are simply a less appealing target. Whether molasses will improve your soil or not depends on how healthy and biologically active it already is, but, as long as you use it according to the instructions provided on the product, it certainly won't harm the other organisms that call your garden home. As a side note I'd like to mention that, barring past use of chemicals that may have decreased the natural amount of biological activity in your soil, plants that are native to your area usually do not require any soil amendments to grow and thrive and are actually adapted to living in soils that are less biologically active.
Dear Dirt Doctor by Howard Garrett
Earthworms - Surprising Partners in the Creation of Healthy Soils - Tilth
Molasses Soil Amendment for Crop Improvement and Nematode Management - S. Schenk
More General Botany Questions
Process of transpiration in plants
November 21, 2005 - I'm in 6th grade and I have a science project to do and the question is, Do living plants give off moisture. The first part of my project is to explain how living plants give off moisture. I've chec...
view the full question and answer
Which one is huajillo and which one is guajillo?
November 19, 2013 - Recently I attended a field trip to the Leonard Garden at the Kleberg Institute in Kingsville. I took a picture of a tree that was referred to as Tenaza or huajillo. Later I took another photo of a ...
view the full question and answer
Plant Groups
September 22, 2009 - What are ways to group plants?
view the full question and answer
Blooms as far as the eye can see
March 06, 2008 - Why are some wildflowers capable of putting on spectacular sweeps of blooms "for as far as the eye can see" such as Indian paintbrush at Vail Pass in Colorado, or bluebonnets in the Texas hill count...
view the full question and answer
USDA Plant Hardiness Zone of Worcester, Massachusetts
November 11, 2008 - What zone is Worcester, Massachusetts?
view the full question and answer
Support the Wildflower Center by Donating Online or Becoming a Member today. |