The processes of plant dormancy begin with triggers that indicate the growing season is nearing end and that winter is approaching. Obvious signs would be the shortening of daylight hours, reduced water, reduced food resources and cooler temperatures. Plants are capable of being fooled out of the process of senescence. Many gardeners have seen perennials, shrubs and trees suddenly show what appears to be spring growth. This often happens if plants that are supposed to be getting ready for dormancy are given fertilizer late in the season, or if there is unusual extended warmth and rain. This is why it is best not to fertilize late in the season, or during autumn planting and transplanting.
It is possible to make a plant that is seasonal stay awake for up to two seasons. Using a Japanese maple as an example; one could bring it indoors and keep it “awake” for a two-season period. But most likely, soon enough, it will die because this type of extreme treatment will exhaust the plants’ stores. This is why it is not a great idea to try to grow anything other than tropical as houseplants.
When the season end “triggers” mount up, signaling end game, processes like pulling the last remaining nutrients from the leaves and transporting them down into crowns and or, roots for winter storage are happening. Plant cells start to reduce the amount of water contained within the cell walls. This small amount of remaining liquid is sugar-laden and acts as a sort of plant antifreeze. This sugary liquid will not expand with freezing temps and explode the plant cells, which causes cell death.
Some plants actually have a capability of having a dormancy set point. These plants require a specific number of hours of dormancy before they awaken for the season. This works well for those times when spring comes suddenly and for a short spell. Gardeners worry when they see spring growth way before the last frosts have finished, and this seems to be happening more these days. But have faith that plants do know when winter is gone. And even if there is an extremely early flush of green life that gets nipped, most of the stored energy is still in the wood and roots and all will be well. Green has always prevailed and it always will.
