Herbaceous Perennial Overwintering and Hardiness

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Table of Contents

Herbaceous Perennial Overwintering and Hardiness

Overwintering Materials

Overwintering Materials: snow

Overwintering Materials: microfoam, similar

Overwintering Materials: geotextiles/ “fleece”/ felt

using geotextile “fleece”

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Overwintering Materials: “sandwich”

Overwintering Materials: “sandwich”

examples from under “sandwich” best covered

examples from under “sandwich” no differences

examples from under “sandwich” best not covered

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When to cover?

Overwintering coverings--tips

When to uncover?

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Overwintering Materials: hoop house

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Overwintering Materials: coldframes

Overwintering Materials: coldframe heat tubes

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Overwintering Materials: evergreen boughs

Overwintering Methods

Soil temperatures

Soil temperatures northern Vermont averages, USDA zone 4, 2”

Container soil temperatures

Hardiness

Genetic differences

Hardiness variables

Controlled Freezing Studies

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Controlled freezing--methods

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Controlled freezing regrowth ratings

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Hardiness variables

Hardiness variables acclimation-- events

Hardiness variables acclimation-- effects

Winter acclimation below freezing Korean bellflower (C. takesimana) (Herrick)

Hardiness variables acclimation-- fall outdoors

Cambridge geranium--acclimation (Luchini)

Hardiness variables

Hardiness variables date of freezing

Hardiness variables date of freezing--research

Hardiness variables

Hardiness variables freeze duration

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Freeze duration--Korean bellflower

Hardiness variables

Hardiness variables cycling temperatures

Hardiness variables cycling temperature ranges

Cycling--Korean bellflower

Cycling--Cambridge geranium (Luchini)

Cycling dates--Cambridge geranium

Hardiness variables

Hardiness variables rate of thawing

Hardiness variables

Hardiness variables older vs newer plants

Hardiness variables

Hardiness variables fertility effects

Hardiness variables fertility studies (Herrick)

Achillea ‘Summer Pastels’

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Fertility dates--Karmina geranium (Luchini)

Fertility types--Karmina geranium

Hardiness variables

Hardiness variables moisture/watering effects

Moisture effects--Sprite Astilbe

Moisture effects-- Coreopsis ‘Tequila Sunrise’

Field Studies Vermont, over 25 years

future research

Appreciation is expressed to the following for assistance with funding

Appreciation is expressed to the following industry members for support and plants

for more information...

for more information...

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Author: Leonard Perry 

Email: leonard.perry@uvm.edu

Home Page: http://www.uvm.edu/~pass/perry/

Other information:
Perennial Production, Hardiness and Overwintering