The difference between them is the Pure Sine Wave inverter produces a better and cleaner current. They are also considerably more expensive. You might find it practical to get a small Pure Sine Wave inverter for any special need you may have, and also a larger Modified Sine Wave inverter for the rest of your applications.
Elm Trees can live over 100 years in their natural environment.
1 Look for areas likely to contain thriving elm trees.  Elms adapt to a variety of climates and planting situations, including poor or mildly salty soil, extreme cold, atmospheric pollution, and drought. However, they prefer areas that are in full sun to part shade with well-drained, but moist, soil.