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PlantsGrowing Environment
Landscape Plant Needs
Appropriate TemperatureHardiness Zones
Appropriate Amount of lightFull Sun – Full Shade
Appropriate Amount of waterDrought tolerant to water plants
Hardiness Zones
A geographically-defined area in which a specific category of plant life is capable of growing, based on it's ability to withstand the minimum temperatures of the zone.
How cold it gets in winter
US Hardiness Zones
Hardiness Zones
Virginia
USDA ZONE 7a
Zones are designated by lowest expected temperatures during winter
Zone #s are in increments of 10 A & B designation are in increments of 5
So if you buy a flower with a hardiness of 8, will it make it through the winter here?
How about if it is 5?
Thermoperiod
Thermoperiod refers to daily temperature change.
Plants produce maximum growth when exposed to a day temperature that is about 10 to 15°F higher than the night temperature.
Plants photosynthesize (build up) and respire (break down) during an optimum daytime temperature
Slower respiration during a cooler night Greenhouses program temperature for
thermoperiods
Vernalization Requirement of plants to go through a
period of cold before they can flower.
Photoperiod
The relative lengths of alternating periods of darkness and light affecting the growth and maturity of plants esp. flowering and dropping of leaves.
The Light Spectrum
Plants only use radiation energy in the visible spectrum.
Chlorophyll does not absorb in the green spectrum
Why?
Photoperiods
Equinox – Fall & SpringEqual hours of day and nightSpring equinox Mar 21 or 22Fall equinox Sept 21 or 22
Solstice – Winter & SummerWinter – Shortest daySummer – Longest day
Plants Short-day plants- don’t flower in summer
ChrysanthemumsPoinsettiasCoffee
Long-day plants- only flower in summerGrains, Carnations
Day neutral plants – photoperiod doesn’t matter
Exposure
Shade: No or only early morning sun Part shade: site that gets only 2 to 6 hours
of direct sun each day. Part sun: same as part shade but includes
more afternoon sun. Full sun: at least 6 hours of sun per day
including noon.
Sun-loving plants
Sunflowers
Marigolds
Geraniums
Roses
Ornamental Grasses
Shade loving plants
Hostas
Impatiens
Caladiums
Fox glove
Coral Bells
Part-shade
Hydrangea Azalea Lenten Rose Astible Begonias
Practice
Slides Outside Plant ID quiz on Friday
Azalea
Spring Flowering Shrub Part shade
Hydrangea
Spring Flowering Shrub Part shade
Knock-out Rose
Summer flowers Shrub Full Sun
Forsythia
Spring Flowering Shrub Full sun
Winged Euonymus
Fall Foliage Shrub Full sun
Periwinkle
Spring-summer flowers Ground cover Shade – part shade
Ajuga
Spring Flowers Ground Cover Part – full shade
Winter Creeper
No flowers Ground cover Full sun to full shade
Pachysandra
Ground cover Full shade
Liriope
Border Small flowers Part shade
Hosta
Summer flowers Part shade
Coral Bells - Heuchera
Sedum
Fountain Grass
Geranium
Marigold
Impatiens
Begonia
Pansy