This document discusses companion planting in organic vegetable gardens. It defines companion planting as establishing two or more plant species in close proximity so they benefit each other. Mechanisms for higher yields include pest control, nutrient uptake, and physical interactions. The document provides examples of companion planting combinations and practices like trap cropping and using plants that repel pests. It emphasizes the importance of experimenting with different spatial arrangements and management factors to achieve the desired benefits.
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Companion Planting Practices and Organic Vegetable Gardening - Sarasota County Extension, Florida
1.
2. Organic Vegetable Gardening
*Companion Planting*
Robert Kluson
Ag/NR Extension Agent
UF/IFAS Sarasota County Extension
3. OUTLINE
Overview of topics of noontime
talks on organic vegetable
gardening
Introduction to organic
vegetable gardening
Companion planting: concepts
and applications
6. Goals for Noontime Talks on
Introduction
Organic Vegetable Gardening
– Food for your freshest nutrition
– Food for expanding benefits of backyard
vegetable gardening
– Food for thought
– Food for your soul
7. Approach of Noontime Talks on
Organic Vegetable Gardening
• Promote the practice of the guidelines in
the reference “Vegetable Gardening in
Florida” by James M. Stephens. 1999.
Univ. of FL, IFAS
• Provide background information on the
science and principles from agroecology
for successful organic vegetable gardening
•
• Provide additional resources available for
successful organic vegetable gardening
8. • Available from UF/IFAS bookstore, see http://ifasbooks.ufl.edu/merchant2/
Also available from your favorite book vender.
9. Agroecosystem Concept
• An approach that looks at your
vegetable garden as a functional whole
of interacting living and non living
components, i.e. “whole is more than
sum of parts”
• A science-based management using
models from natural ecosystems
Gliessman, S., 1999. Agroecology: Ecological Processes in Sustainable Agriculture
11. Organic Vegetable Garden Ecology
Garden Agroecosystem Example
pests
crops
soil
• Garden agroecosystems have functional properties &
subsystems from biodiversity management
12. What is Companion Planting?
• It’s the establishment
of two or more plant
species in close
proximity so that some
cultural benefit that
results in higher yields
is derived.
• Groups of plants
which grow well
together are called
"companions."
13. Companion Planting Origins
• Traditional recommendations
used by gardeners have evolved
from an interesting combination
of
– historical observation
– horticultural science, and
– a few unconventional sources
(e.g., sensitive crystallization tests
by Biodynamic practitioners using
solution mixtures of potential
companion plants) Crystallization example
14. Why Companion Planting?
• Naturalists have known about the interactions
among plants for thousands of years
– For example, about 2,000 years ago the Roman
agriculturalist, Varro, declared "Large walnut trees
close by, make the border of the farm sterile."
– Some pest control potential is based on
insecticides derived from plants, e.g., rotenone,
sabadilla and ryania.
– Certain trees move groundwater to the soil surface
where shallow-rooted plants can grow even under
droughty conditions.
15. Companion Planting Examples
Table 1. COMPANION PLANTING CHART FOR HOME &
MARKET GARDENING (compiled from traditional literature on
companion planting)
CROP COMPANIONS INCOMPATIBLE
Asparagus Tomato, Parsley, Basil
Beans Most Vegetables & Herbs
Beans, Bush Irish Potato, Cucumber, Onion
Corn, Strawberry, Celery,
Summer Savoury
16. Beans, Pole Corn, Summer Savoury, Onion, Beets,
Radish Kohlrabi,
Sunflower
Cabbage Aromatic Herbs, Celery, Dill, Strawberries,
Family Beets, Onion Family, Pole Beans,
Chamomile, Spinach, Tomato
Chard
Carrots English Pea, Lettuce, Dill
Rosemary, Onion Family,
Sage, Tomato
Celery Onion & Cabbage
Families, Tomato, Bush
Beans, Nasturtium
20. Tomato Onion Family, Nasturtium, Irish Potato,
Marigold, Asparagus, Fennel, Cabbage
Carrot, Parsley, Cucumber Family
Turnip English Pea Irish Potato
21. Does Companion Planting Work?
• While companion planting has a long
history, the mechanisms of beneficial
plant interaction have not always been
well understood.
• Recently dentified mechanisms for higher
yields include
– Pest control
– Nutrient uptake
– Physical spatial interactions
22. Why Companion Planting?
• The concept provides strategies that
increase the biodiversity of garden
agroecosystems by mimicing the
non-negative examples of biodiversity
of natural ecosystems.
• A key to success is experimentation
and observation of plant to plant
interactions in your garden
agroecosystem
26. Companion Planting Practices
“Trap cropping”
• - a neighbouring
crop may be
selected
because it is
more attractive
to pests and
serves to distract
them from the
Collards (trap crop) and cabbage (food crop)
main crop to draw the diamond back moth away from cabbage
27. Companion Planting Practices
“Biochemical Pest Suppression”
• some plants exude
chemicals from roots
or aerial parts that
suppress or repel
pests and protect
neighbouring plants.
Marigold with cabbages to
repel nematodes
28. Companion Planting Practices
Herb Companion Planting for Repelling Pests
Some of the earliest written documents on
gardening discuss herbs as companion plants for
deterring pests.
When selecting your companion plants you will
need to consider more than which pests are
deterred, e.g., what effect the proximity of strong
herbs may have on the flavour of your vegetables.
29. Insect Crop and Herb Plants that Repels
Ants Onions, Tansy, Mint family
Chives, Garlic, Marigolds, Mint family, Dried and crushed
Aphids
chrysanthemum flowers, Coriander, Onions, Oregano
Cabbage
Rosemary, Sage, Thyme
Moths
Cabbage
Tomatoes, Celery
Worms
Carrot Flies Leeks, Sage, Rosemary
Colorado
Marigolds, Nasturtiums, Flax
Potato Beetles
Cucumber
Nasturtiums, Radishes, Tansy
Beetles
Flea Beetles Catnip, Garlic
Flies Basil, Tansy
Leafhoppers Dried and crushed chrysanthemum flowers
Mosquitoes Basil, Garlic, Geranium (citrosa)
Onion Flies Garlic
Ticks Garlic
Tomato Worms Borage
30. Companion Planting Practices
• “Symbiotic nitrogen fixation”
- legumes have the
ability to fix
atmospheric nitrogen
for their own use and
for the benefit of
neighbouring plants
via symbiotic
relationship with Bush beans intercropped with
Rhizobium bacteria Chinese vegetables
31. Symbiotic Nitrogen Fixation
Nodules • N-fixing bacteria (e.g.,
on legume Rhizobium species)
roots,
e.g., peas,
infect roots of legumes
beans, etc & induce formation of
specialized nodules
• Benefit of this process
Nodules with is the transformation
good N fixation of atmospheric N to
activity have an plant N, e.g., protein
internal red
color due to • Correlates with ‘high
leghaemoglobin
. protein’ content of
legumes
32. Companion Planting Practices
“Physical Spatial
Interactions”
• for example, tall-growing,
sun-loving plants may
share space with lower-
growing, shade-tolerant
species, resulting in higher
total yields from the land.
“3 Sisters” of corn/bean/squash
33. Companion Planting Practices
“Physical Spatial Interactions” (cont.)
“Nurse crops”
– for example, tall or
dense-canopied plants
may protect more
vulnerable species
through by providing a
windbreak. Taller grain crop protecting
shorter transplanted crop
from wind damage
34. Companion Planting Practices
“Beneficial Habitats”
– provide a desirable
environment for
beneficial insects and
other arthropods—
especially those
predatory and parasitic
species which help to
keep pest populations in
check.
35. Companion Planting Management
• Success Factors Include:
– Spatial arrangement
– Plant density
– Maturity dates
– Plant structure
• However, most recommendations do not
specify them. Therefore, experimentation
is required.
40. Companion Planting Management
• Example ‘spatial arrangements’ include:
– Row intercropping — growing two or more crops at the
same time with at least one crop planted in rows.
– Strip intercropping — growing two or more crops
together in strips wide enough to permit separate crop
production but close enough for the crops to interact.
– Mixed intercropping — growing two or more crops
together in no distinct row arrangement.
– Relay intercropping — planting a second crop into a
standing crop at a time when the standing crop is at its
reproductive stage but before harvesting.
41. Companion Planting Management
• Example different spatial arrangements for
native American “3 sisters” companion planting
(corn/bean/squash):
Figure 1: Circular Figure 2: Hidatsa Garden Figure 3: Zuni Waffle
Wampanoag Garden Design Garden
(Northeast & South) (Northern Plains) (Southwest Desert)
42. Companion Planting Research
• Over-Yielding Assessment Factors Include:
– a method for assessing companion crops performance as
compared to pure stand yields
– calculated figure is called the Land Equivalency Ratio
(LER), i.e., the yield advantage the intercrop has over the
pure stand, if any.
– for example, a corn/pea intercropping
– measure the yields from pure corn, pure peas, and the yields
from both corn and peas growing together
– calculate the LER = (intercrop corn yield / pure corn yield ) +
(intercrop pea yield/ pure pea yield)
– LER values above 1.0 show an advantage to intercropping,
while numbers below 1.0 show a disadvantage
43. Summary
• Companion crops help
develop a functional
garden agroecosystem
• Choose companion crops
to best fit desired
purpose(s) and niche(s)
for increase biodiversity
• Careful experimentation
and management is needed
to provide desired benefits
44. Food For Your Soul
• The Legend of the Three Sisters
• The term "Three Sisters" emerged from the
Iroquois creation myth. It was said that the
earth began when "Sky Woman" who lived in
the upper world peered through a hole in the
sky and fell through to an endless sea. The
animals saw her coming, so they took the
soil from the bottom of the sea and spread it
onto the back of a giant turtle to provide a
safe place for her to land. This "Turtle Island"
is now what we call North America.
45. Food For Your Soul
• Sky woman had become pregnant before she
fell. When she landed, she gave birth to a
daughter. When the daughter grew into a young
woman, she also became pregnant (by the
West wind). She died while giving birth to twin
boys. Sky Woman buried her daughter in the
"new earth." From her grave grew three sacred
plants—corn, beans, and squash. These plants
provided food for her sons, and later, for all of
humanity. These special gifts ensured the
survival of the Iroquois people.
46. References
• Beyfuss, R. & M. Pritts. 2010. Companion Planting:
Ecogardening Factsheet #10
http://www.gardening.cornell.edu/factsheets/ecogardening/com
plant.html
• Gliessman, S.R. 1998. Agroecology: Ecological
Processes in Sustainable Agriculture. Sleeping Bear
Press
• Hill, S.B. Companion Plants. Ecological Agriculture
Project http://eap.mcgill.ca/publications/EAP55.htm
• Kuepper, G. & M.Dodson. 2009. Companion Planting:
Basic Concepts & Resources. ATTRA publication IP
125 http://www.attra.org/attra-pub/complant.html
47. References
• Our Garden Gang. Companion Planting.
http://ourgardengang.com/companions.htm
• Sullivan, P. 2003. Intercropping Principles and
Production Practices.
http://www.attra.org/attra-pub/intercrop.html
• Plangarden. 2009. Comparison of Companion
Planting Guides of Most Common Vegetables.
http://plangarden.files.wordpress.com/2009/05/cp-partiii-tables-
nopic1.pdf