Showing posts with label hardy. Show all posts
Showing posts with label hardy. Show all posts

Hardiness Zones: Changing?

What planting zone are we in? Often the hardiness zone a particular plant will grow in appears on the plant tag, so this is important information you need to know.

I’ve always planted as though we’re in USDA Zone 8, although many of my master gardener friends have told me we’re in zone 7. Our garden does have a sheltered location. We probably have a microclimate since our property slopes to the south, providing our plants with protection from those cold north winter winds.

But what zone are we truly in? Drastic changes in average low temperatures over the last several years have caused many to believe the USDA Hardiness Zone map is out of date. The last update occurred in 1990. A new map was proposed in 2003, but rejected. The National Arbor Day Foundation decided to go ahead and update their map anyway, and it’s worth taking a look at. They used data from the National Oceanic and Atmospheric Administration to formulate the new map. According to them, the changes in average low temperatures have changed so much that planting zones would change by as much as two zones!

I’ve noticed myself for years that several of my "houseplants" return each summer in our shade garden. Among them are spider plant, split-leaf philodendron, and butterfly plant.

Well, anyway, according to the new Arbor Day Foundation hardiness zone map, we’re now in Zone 8!

You can take a look at the map yourself, by going to www.arborday.org. This new information gives us many more plant choices for our garden!

Our Native Hibiscus is easier to grow than Tropical Hibiscus!


Every summer many, many people purchase the Tropical Hibiscus to place on their patio, porch, or around their pool. While it is true that the Tropical Hibiscus is beautiful and really does lend a tropical look to the garden, it will die to the ground with the first frost unless you live in the sub-tropical states. And if you've ever tried overwintering one indoors, you know how difficult that can be!


Instead, consider our American Native Hibiscus varieties. There are several, and in my opinion they are much more beautiful than the Tropical Hibiscus. Our native hibiscus is an herbaceous perennial plant that grows to shrub size each summer.


Hibiscus coccineus has bright red star-shaped blooms all summer on tall stems. This native hibiscus is known by many common names, among which are Texas Star Hibiscus, Swamp Hibiscus, and Swamp Mallow. The Swamp Hibiscus loves consistently moist soil but grows well in my garden with only weekly waterings. Hibiscus coccineus is beautiful even when not in bloom, having reddish-tinged green leaves shaped like maple leaves. (Some visitors have claimed it looks like marijuana, but I can't say for sure, since I've never seen a marijuana plant. Perhaps they're telling on themselves!)


'Very spectacular' is the best description for Hibiscus moscheutos or Swamp Mallow. Blooms are the size of a dinnerplate! (See the photo above, one of the plants in our garden!) Hybridizers have developed many types and colors, but all are beautiful and any one would be a show piece in your garden.


The native hibiscus is so easy to grow that it would be a shame not to have some. H. coccineus is hardy as cold as USDA Zone 6 and H. moscheutos is happy as cold as USDA Zone 4! Wow! They are deciduous plants but will return in May each year with no special care.


For more information on availability of the hardy native hibiscus, contact us anytime at http://shadygardens.biz/