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.
The weeping cherry at right is quite magnificent, but has clearly outgrown the small space originally allocated when it was a sapling. So this is one of the problems to consider when purchasing an ornamental tree. Other common problems associated with grafted trees include water sprouts, suckers, and diseases.