Horticultural Myths
Fact Sheets & Case Studies
Landscape Rehab Projects
Research Projects
Curriculum Vitae
Selected Publications
Seminar Schedule
Contact Information

Horticultural Myths

Looking for the newest myth-information? Check out our blog The Garden Professors. You'll find science-based information from four horticultural professors from around the country.

The following Adobe PDF documents require Adobe Acrobat Reader installed on your computer in order to view or print these files.


Bone meal

Fertilizer injection

Foliar fertilizers


Part 1
Part 2: Roses and phosphate
Part 3: Red leaves and phosphate

Seaweed extracts

How plants work


Cold hardiness and magnesium/potassium

Drought-tolerant plants

Invasive species

Leaf wilt and water

Light and flowering


Plant size and nursery tags


Topping young trees

Maintaining trees and shrubs

Disinfecting pruning tools

Irrigation and dormancy

Native plants

Plant quality

Pruning new transplants

Tree topping

Vibration and soil compaction

Water drops and sunlight

Wound dressings


Bark and sawdust

Dust mulches (Literature)

Landscape fabric

Newspaper and cardboard sheet mulches

Rubber mulch

Wood chips

Arborist wood chips (Literature)
Cedar woodchips
Uncomposted wood chips

Yard waste


Bacillus thuringiensis (Bt) (Literature)

Baking soda (Literature)


Compost tea

Part 1
Part 2
Part 3 (EPA statement about pesticidal use of compost tea)
Part 4 (Literature)

Corn gluten meal



Horticultural oils (Literature)

Milk sprays

Planting techiques

Aeration tubes

Instant landscaping

Nursery brochures

Pressure treated lumber

Root balls, part 1

Root balls, part 2


Timing of planting

Vitamin B-1

Wire baskets

Scientific literacy


Companion plants

Credible information


Old horticulturalist tales

Organic superiority

Soil amendments

Coffee grounds (Literature)

Container drainage

Epsom salts (Literature)


Organic matter

Part 1
Part 2: Compost
Part 3: Nutrient overload
Part 4: Water quality issues

Peat moss

Polyacrylamide gels

Part 1
Part 2
Part 3 (Literature)


A recently transplanted tree that failed due to following a horticultural myth. The native soil was removed and replaced with organic matter, leading to drought and other stresses that killed the tree (L. Chalker-Scott).

Contact us: Linda Chalker-Scott 253-445-4542 | Accessibility | Copyright | Policies
WSU Puyallup Research & Extension Center, 2606 W Pioneer, Puyallup, WA, 98371-4998 USA