The answer to 'why is my garden invasive plants' is that your garden may have become overrun with invasive plant species. Invasive plants are non-native species that grow and spread aggressively, often out-competing native plants and disrupting the natural ecosystem. Common causes include improper plant selection, seeds or roots being introduced from other areas, and lack of proper maintenance and control.
Symptoms of an invasive plant problem include rapid growth, the spread of the plant to new areas, and a decline in the health and diversity of your desired garden plants. Solutions involve identifying and removing the invasive species, as well as taking steps to prevent their return. This may require regular weeding, mulching, and planting native alternatives. For severe infestations, it's often best to call in a professional landscaper or horticulturist who can properly assess and treat the problem.