1. Plant more trees: In common, few old trees die due to old age or get destroyed due to heavy winds and rains. This natural phenomenon decreases number of trees. So planting trees where possible is an answer to this natural reduction in tree population.
2. Use Tree guards: When the plant is small, it has small trunk which can be easily broken down by animals or even machines during work. Even few cattle try to graze on them. So until plant grows into a big tree, it is good to keep their trunks protected by use of tree guards.
3. Use organic fertilizers: While you grow any tree, do not use artificial chemical fertilizers. It is believed than natural fertilizers enhance life span of plants. The plants grown by use of natural fertilizers are found to be less prone to diseases and pests. Also they are stronger and more durable than those grown by use of artificial fertilizers.
4.Prefer to grow fruit or other valuable trees: Trees grown in lawn or farms, if not useful are cut off for more space or beauty in future. So try to grow trees which yield fruits or other valuables. In this way, one may not develop a desire to cut them off in future if the find it intrusive.
5. Prevent excess deforestation: This might need a community effort. In many places of the world, there is extensive deforestation in the name of development and industrialization. In the process many old trees are cut down mercilessly. One can prevent such deforestation by organised efforts.