Plants that are mainstays of horticulture also carry lots of risk, a new Agricultural Research Service (ARS) study has found. Naturalization rates of non-native horticultural plants increase the longer a plant is grown and sold.
Unlike previous studies on the invasiveness of horticultural plants, the research team found that the marketing period--the number of years a plant was sold--has profound influence on naturalization and invasion. Seventy percent of plants sold in Florida for 30 years or longer naturalized, according to Pemberton, indicating that length of time sold is the most important factor contributing to naturalization.
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