French hydrangea flowers for 5 to 9 weeks in late spring or early summer. The mophead or lacecap flowers develop from buds formed in the tips of stems the previous year (on old wood). Most older cultivars bloom just once.
Scientists discovered, and have confirmed, that sulfur dioxide (SO2) and nitrogen oxides (NOx) are the primary causes of acid rain. In the US, About 2/3 of all SO2 and 1/4 of all NOx comes from electric power generation that relies on burning fossil fuels like coal.cid rain is a broad term used to describe several ways that acids fall out of the atmosphere. A more precise term is acid deposition, which has two parts: wet and dry.
Air pollution is also a cause of global warming andacid rain.   Causes Of Air PollutionBasically the air pollution is caused by the burning of fuel that directly releases hazardous chemicals into the air. For example the burning of coal releases sulphur dioxide, a poisonous gas which is responsible for acid rain.ut common pollution is caused by fumes emitted for factories, cars, burning of fossil fuels; throwing waste on roads, beaches; releasing harmful chemicals into the water bodies, etc. It is caused by people, animals and natural events. Industries or too much smoke in the air or the environment being a mess or disaster.