Mistletoe the host plant. "Viscum album" successfully parasitizes more than 200 tree and shrub species. All mistletoe species are hemiparasites, because they do perform at least a little photosynthesis for at least a short period of their life cycle. However, in some species its contribution is very nearly zero. For example, some species, such as "Viscum minimum", that parasitize succulents, commonly species of Cactaceae or Euphorbiaceae, grow largely within the host plant, with hardly more than the flower and fruit emerging. Once they have germinated and attached to the circulatory system of the host, their photosynthesis reduces so far that it
Plant-for-the-Planet 1 million trees in each of their own countries. Plant-for-the-Planet promotes the view that each tree is a contribution towards environmental and climate protection. It also suggests that each tree planting is an action for social justice. The organisation says that it is most often the developing countries that suffer the most from the effects of climate change, despite the fact that they have most often done the least to cause it. Plant-for-the-Planet says it considers each tree to also be a symbol for climate justice. By the start of 2011, there were children participating in more than 93 countries.