temperature to bring moisture into the higher portions of the atmosphere. Flora Tropical flora typical of more southerly locations is grown in the Melbourne area (coconut palms, royal palms, Christmas palms, and bananas), but can be damaged or killed when subjected to infrequent light freezes or cooler temperatures, although several years might pass without a freeze in the Melbourne area. The Melbourne area has many lush gardens and public landscapes, and is noted for the botanical northern limit of cultivated coconut palms on the Florida East Coast. Environment The Florida Department of Environmental Protection has ordered the city to reduce pollution of the Indian River Lagoon, which it borders; about 80% of the city's landmass drains in the direction of the lagoon. The city must reduce run-off by of nitrogen and of phosphorus. The city responded by banning the use of fertilizer before flood and storm warnings. Demographics As of 2010, there were 38,955 households, out of which 12.6% were vacant. As of 2000, 24.0% had children under the age of 18 living with them, 44.0% were married couples living together, 11.5% had a female householder with no husband present, and 40.7% were non-families. 32.9% of all households were made up of individuals, and 13.3% had someone living alone who was 65 years of age or older. The average household size was 2.22 and the average family size was 2.82. In 2000, the city the population was spread out, with 20.7% under the age of 18, 9.3% from 18 to 24, 28.4% from 25 to 44, 21.9% from 45 to 64, and 19.7% who were 65 years of age or older. The median age was 40 years. For every 100 females, there were 94.3 males. For every 100 females age 18 and over, there were 91.1 males. The per capita income for the city was $19,175. In 2000, the median income for a household in the city was $34,571, and the median income for a family was $42,760. Males had a median income of $32,242 versus $22,419 for females. In Melbourne, about 8.6% of families and 11.5% of the population were below the poverty line, including 15.4% of those under age 18 and 8.5% of those age 65 or over. Languages As of 2000, 90.39% of residents spoke English as their first language, while 4.69% spoke Spanish, 0.84% spoke French, 0.73% spoke German, and 0.55% spoke Arabic as their mother