by Carrie P. Williams
You knew it was going to happen. After a few gorgeous weeks
of warm weather, the belief that spring was finally here
settled in your head, only to be blown away by a North wind
and freezing temperatures. Not only were you taken off
guard, just look at your plants: they likewise had thought
it was spring, and their once colorful flowers are now just
hanging down, brown and limp. Yes, you sigh, that is the way
Nature goes sometimes, but was there anything you could have
done to prevent such a massacre?
Gratefully, there are some actions you can take against
freezing, but first, you need to know what you're up
against. One of the biggest questions concerning freezing is
why it poses a bigger problem in early fall or late spring
than in all of the winter months. After all, that is when it
usually gets the coldest. However, what actually harms
plants is not the cold temperatures themselves but the
extreme temperature fluctuations that can occur during the
changing of the seasons.
During the winter, most plants are dormant, which
essentially means that they have boarded up for the winter.
They have prepared and protected themselves for the cold
weather. During the change to spring, a few warm days can
fool many plants into 'unpacking' early, shooting out
sensitive new leaves and flowers. If the temperature
suddenly drops one night below freezing, this sensitive
tissue is injured or killed. The same thing happens
occasionally during the fall if a plant has not gone fully
dormant by the first freeze.
Another puzzler is what creates the difference between a
frost advisory and a hard freeze advisory that can be issued
by weather services occasionally. The main deviation is the
expected low temperature. A frost is generally defined as
temperatures briefly falling to between 28 and 32 degrees
Fahrenheit. This can harm plants that cannot tolerate
freezing conditions at all, but adapted, established plants
should not suffer much, if any, harm.
A hard freeze, on the other hand, can mean serious business.
It is generally defined as temperatures reaching 28 degrees
Fahrenheit or lower during a time when some plants are
coming out of dormancy. Even established plants that are
hardy for that particular climate can be injured or killed
if they are breaking into leaf or flower. For gardeners,
this is a warning well-heeded if you want to keep your
prized plants from turning into a mushy, brown slime.
You may not be able to control the weather, but thankfully
you can still go through some preventative measures in order
to save your landscape. The best thing you can do is mulch.
Providing a two to four inch layer of mulch will serve as an
insulating blanket for your plants' roots; keeping the soil
warmer than the surrounding air. Even your plants can
appreciate having warm, toasty toes during a cold night.
nce a frost or freeze warning goes out for your area, make
sure you get out in your landscape and water all of your
plants. During a frost or freeze, plants still lose water
through their leaves into the air, and with the water in the
soil frozen solid, they cannot take up the needed water. By
giving your plants a quenching drink before the temps drop,
they will enter the freeze hydrated and able to better
tolerate a cold night.
For your most susceptible plants, sometimes mulching and
watering are not enough, especially for those sensitive
flowers. If your delicate plants are in a container, you can
bring them into a storage area or basement for the time
being, which will protect them from the worst of the
temperatures.
If your flowering, tender plant is firmly established in the
ground, don't worry; there are a few more options you can
implement. A good rule of thumb to remember is 'when
expecting a freeze of late, don't forget to decorate!' By
covering your tender plants with sheets or Christmas lights,
you will keep that tender leaf and flower tissue warm, never
mind what your neighbors think. Once the freeze is over,
your yard will be the one greening out and blossoming.
When next a frost or freeze warning is next issued for your
area, you won't need to panic. Now you not only know the
difference between frosts and freezes, you know a variety of
methods to combat the cold temperatures head-on. Thankfully,
most areas only have to worry about a hard freeze a few
times a year. Next time it does happen, however, you will be
fully prepared to take on Old Man Winter, sheets and
Christmas lights in hand.
Carrie P. Williams is a professional landscape designer with Turf Tamer, Inc.
She has written many informative landscaping articles for Turf Tamer's Tip of
the Week program. Want to learn more landscaping tips and tricks? Go to
http://www.turftamerinc.com to find
more tips.