Geodes can be found all over the world. Areas with the most geodes, however, tend to be deserts, volcanic ash beds, or areas with plentiful limestone. In the United States, for example, you can find plenty of geodes in California, Arizona, New Mexico, Utah, Nevada, Iowa, Missouri, Illinois, Indiana, Kentucky, and Ohio.
Water and Sunlight. Basil plants are low-maintenance and do not require much care. What little care they require, however, is important to keeping the herb healthy and the foliage supple. Too much water, too little water and lack of sun will turn the basil leaf tips brown and cause them to curl. Basil -- whether growing indoors or out -- requires at least six hours of full sun to keep it healthy.
Slugs and Snails. Insect pests don't usually cause brown leaf margins, with the exception of snails and slugs. These pests feed on the edges of the foliage, leaving them ragged and brown. They can also cause ragged holes in the center of leaves. Sprinkle slug bait granules on top the soil around the perimeter of the hosta bed. Reapply the granules weekly or after heavy rainfall.