Plants need to build their food reserve for winter and in the absence of good soil conditions and balanced fertilizer use, plants become more prone to winter damage.
With low nutrients in reserve, plants get weak and they are unable to fight low light and temperatures and decay occurs.
Plants grown with organic fertilizers are stronger and more capable to fight winter challenges compared to chemically grown plants.
For best winter protection, spray Kelp Boost twice during late summer and early fall using 5 ml / litre (1 tsp) and also drench the roots with the solution.
Also apply 15-20 g of Starter Food per shrub or 100 g per sq.metre during late summer. Together the two treatments will provide needed nutrients for winter.