Brain disorders can also have an effect on the display of delta waves. Parkinson's disease, schizophrenia, and narcolepsy are all characterized by changes in delta wave activity. Some drugs and chemicals have been shown to impact the brain's delta waves.
Pruning advanced ornamental trees. Now's the time... Generally speaking an ornamental tree is one that is grown for its decorative looks and not for food. Winter is the perfect time to prune deciduous ornamental trees, as their structures are dormant. Inside the tree though, important processes are underway.
Other ornamental grasses to watch out for include: 1  Pampas grass, Cortaderia selloana, is handsome but invasive, with sharp, grass-like foliage and large, feathery white or pinkish plumes. 2  Itâs a fast-grower, reaching up to 10 feet tall and wide.