Winter protection for plants
Although it is best to choose for a skeleton of the garden very resistant plants which are beautiful and look healthy in every part of the year, still a true gardener in his garden have some plants which does not belong to his climat or a plant that comes from some exotic warmer areas. The simplest solution for this plant to have it permanently in the collection is that we plant in pot and occasionally bring it inside the house if cold weather come and this plant may be damaged or completely destroyed. Yet planted in pots plants never have dimensions and beauty like plants planted in the ground. To even try to grow the plants from warmer areas in the garden it is necessary to study the climate and your absolute minuses in recent decades, and based on that, select the type that is possibly marginal in relation to those terms. Planting in the ground plants which are two temperature zones over your makes no sense because sooner or later the plant will die. When talking about temperature zones i think on the division of the USDA temperature zones, for most plants on Daves Garden you may find resistance data and some growers experiences.
Although an absolute minimum is not the only requirement is usually the most important factor in growing. Beside absolute minimume there is a winter moisture, which in conditions of low temperature leads to the development of fungal disease and quickly draws heat from the plant, then the number of sunny days, wind, drainage of the soil etc. The problem of absolute minimum is that it is sufficient just a single day in the year that the temperature drops below permitted and that means the end of the plant, especially when the plant is smaller and more sensitive. In other words it is possible to grow a spectacular plant if you protect it just that one day or more a year!!!
Only wrapping in protective cloth is usually not enough when cold penetration lasts long enough, and so I lost a lot of plants, thinking that wrapping protect them. Still need a source of heat. If you have only a single plant is enough to wrap in cloth and wrap around the plant any bulbs or heating cables, if you have several plants in small area it is best to built small greenhouse with the help of structural steel diameter 12mm and transparent plastic that easily captures and holds with the stapler , as a heat source it is best heater with a fan to mix the warm air through the greenhouse.
For stability and strong winds I put stons in plastic pockets.
When is warmer winter weather it is good to open greenhouse so moisture can get out of greenhouse.
On this way for years now I am growing plants of USDA zone 9b ina my zone 9a, plants like bismarckia nobilis, ravanea rivularis, howea forsteriana, various sensitive aloe, phoenix rupicola, archontophoenix cunninghamiana and others ..
sometimes when your garden is hit with a winds above 200km’h nothing can help…
syagrus romanzzofiana broked like toothpick
For example real enthusiasm and protecting i recently found in a private garden where the owner built up a huge greenhouse to protect bismarckia nobilis…