The Universiy of Illinios Extension Service defines aggressive plants as those that have the ability to "spread fast enough within the garden as to cause issues to other garden areas where the plant is not wanted or is intended to be growing." This is not the same as being identified as being invasive. An example is the so-called 'red' thyme, though its flower color is really more of a pink or lavender. It's also important to note that there is a difference between a plant being considered invasive and one that grows aggressively. Some types of thyme ( Thymus) ground cover flower profusely, albeit minutely. So, although some of the plants above are noted as being invasive in certain regions, they are fine to grow in others. You can also use a selective herbicide, provided you consult an expert beforehand. When removing weeds, make sure you dig out any remaining roots or tubers. Keep in mind that a plant may be invasive in one environment, but okay to grow in another. Pull out each weed by grabbing the stem as close to the ground as possible. From the USDA website: "An invasive species is non-native to the ecosystem under consideration, and whose introduction causes or is likely to cause economic or environmental harm or harm to human health." When learning about plants, it's important to understand what it means for a plant to be invasive. Plants to try: ‘Big Ears' (large leaves up to 8 inches long), 'Silky Fleece' (a dwarf variety with tiny 1-inch leaves), ‘Silver Carpet’ (silvery blue foliage, nonflowering) *INVASIVE VS. Where to use: Sunny spots where you need a dense, weed-suppressing ground cover. Special attributes: Not bothered by pests or diseases coordinates well with almost everything. Very tolerant of a range of soils from dry to moist, however not waterlogged. This is a mat forming plant that will spread quickly, yet is easy to control. Height/spread: 3 to 10 inches (taller when in flower), spreads up to 2 feet Useful for underplanting and will reach a height of around 10cm (4 inches). Upright stalks of pink or purple flowers in early summer add to the overall height, but you can find cultivars that bloom rarely or not at all. As you walk across creeping thyme, the leaves. It has a sprawling growth habit growing to 3-4 inches tall above the ground (7-10 cm) and 6-18 inches (15-46 cm) spread. pseudolanuginosus) quickly forms a hardy, silver-tinged carpet. Creeping thyme is a short-lived woody perennial covered in foliage, lasting around 3 to 5 years before becoming unproductive and spindly. Elfin) stays below 2 inches, while wooly thyme (T. ![]() Their fuzzy texture and silver overtones contrast beautifully with many other garden perennials. Creeping thyme is one of the more popular suggestions for high traffic ground cover and includes a few different varieties for different needs. Soft oblong leaves make this plant so irresistible.
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