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GROUND COVER THYMES |
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Ground Cover Thymes are not only beautiful and soft to walk on, they are also the perfect way to keep the ground cool and conserve moisture. Once established, ground cover thymes also help to keep weed seeds from sprouting. In the photo above five ground cover thymes of varying colors, textures and heights are growing in a pleasing mosaic. Pink Lemonade Thyme is the bright green thyme that has the shadow of the tree on it. It flows into the silvery Woolly Thyme near the boundary board which separates this garden from the lawn. The taller flowering Caraway Thyme is in the foreground to the right of the Woolly Thyme. In the back, Heretus Thyme is also in full bloom. If you look closely you can see a small patch of a slightly bluer thyme in between the two flowering ones. This is the tiny Elfin Thyme. It is being threatened by the fast growing Pink Lemonade Thyme which will probably take over both the Elfin Thyme and the Woolly Thyme in a year or so. |
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CHOOSING THE RIGHT GROUND COVER THYME Thymes are a blessing and a curse. A blessing because there are so many different kinds and a curse because there are so many different kinds. Culinary Thymes are pretty easy. There aren't too many and their names are fairly descriptive, like Lemon Thyme. It is the Ground Cover Thymes that tend to confuse. Most folks want to use the Ground Cover Thymes to cover the ground. Not much of a surprise there. But, different folks have different amounts of ground to cover and different expectations' of what a ground cover is. It is important to know the difference between a ground cover thyme that is appropriate for a two-inch space and one that is appropriate for a twenty foot space. It is also necessary to understand that all ground covers are not flat and lawn like. Faster growing thymes stuffed into a small space will disappoint with time. They will cover up stepping stones, spreading their stems onto paving searching for ground to root in. Slower growing thymes are more appropriate for small spaces like those between flagstones. How They Grow Just like all plants, thyme plants spread by growing from one set of leaves to the next. In between the leaves is a stem segment. Some thymes produce sets of leaves very close together while others are spaced further apart. Stem segments grow faster without having to produce tightly knit sets of leaves. |
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Therefore, a plant like this Creeping Pink Thyme with almost an inch of stem between its sets of leaves grows much more quickly than say a Pink Chintz Thyme or a Woolly Thyme whose leaves are very close together. This increased stem segment also provides a greater rooting zone for the thyme allowing it to spread faster. As long as the ground is moist where that stem segment hits, the plant will root and continue to creep. Ground Cover Thymes can take light foot traffic. However, just like any plant, if the leaves are repeatedly rubbed they will fall off and the plant will die. If you have a high traffic area, consider putting in a hardscape walkway with thymes in between. |
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The Big and the Small of It Slower growing thymes for in between stepping stones and flagstones include Annie Hall, Elfin Thyme, Leprechaun Thyme, Silver Needle Thyme, Pink Chintz Thyme, Mint Thyme, Woolly Thyme, White Moss Thyme and Highland Cream Thyme. Elfin Thyme and Leprechaun Thyme are very small and very flat (about 1/4 inch to 1/2 inch tall). They are the slowest growing of this group and are the logical choices for those two inch spots. They bloom very little which help them to remain closer to the ground. Pink Chintz Thyme , Mint Thyme and Annie Hall Thyme are slightly taller (1 to 2 inches with the flowers) but have the distinction of putting on a spectacular flowering show. Pink Chintz blooms very early in spring, followed by Mint Thyme, with Annie Hall blooming well into the summer. Woolly Thyme and White Moss Thyme (sometimes called Creeping White Thyme) are also slower growing, very flat and do well between stones where space is cramped. Woolly Thyme is the most silver leaved of all the Thymes and never blooms, while White Moss Thyme is a lovely chartreuse with little white flowers in late spring. Highland Cream Thyme is our variegated stepping stone filler. Leaves of soft cream and green make this tiny thyme a must have for brightening up dark stones. In hot summer areas, it prefers afternoon shade. Silver Needle Thyme has the most unique leaf structure and grows flat enough to make a good flagstone filler. Faster growing, wider spreading thymes more suitable for large spaces include Pink Lemonade Thyme, Doone Valley Thyme, Goldtream Thyme, Creeping Pink, Caraway Thyme, Lemon Frost Thyme, Lavender Thyme, Loveyanus Thyme, Reiter's Thyme, Hall's Woolly Thyme and Coconut Thyme. Of these large space thymes those that are lowest and most suitable for areas that you want to look more like a lawn are Pink Lemonade, Goldstream, Creeping Pink, Lemon Frost, Reiter's, Hall's Woolly and Coconut. Caraway Thyme is the fastest growing but it does have a pillowy mounding habit instead of a "looks like a lawn" habit. It can be walked on and is extremely rugged. It cascades nicely down hillsides that aren't too steep. Caraway Thyme is the only culinary Ground Cover Thyme in the bunch. Lavender Thyme will spread like a ground cover but it does get taller and is more suitable for areas that need cover but don't get walked on too much. Doone Valley Thyme is one of our favorite ground cover thymes but again it is a bit taller at about four inches with flowers. Loveyanus Thyme is amazingly beautiful in large spaces. It has the largest flower of all the thymes and works well planted with other ground covers like Erigeron and Creeping Golden Marjoram. Flowers Are Fun But... Most Ground Cover Thymes, but not all, bloom for about three to four weeks between mid spring to mid summer. Pink Lemonade wins the "blooms the longest" award. It waves its lovely pink blooms throughout the growing season. On the other end of the bloom spectrum is Woolly Thyme which does not bloom at all. (Don't confuse Woolly Thyme with Hall's Woolly Thyme which blooms profusely). Obviously if most ground cover thymes bloom for only a short period of time it is may be more important to consider the different colors of the leaves. These run from very dark green, like Goldstream and Lemon Frost, to chartreuse, like White Moss Thyme. |
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PREPARING THE SITE Thyme needs a sunny (about four hours a day or more), well drained spot to grow prolifically. Too little sun will result in a leggy stem instead of a stem that hugs the ground. To prepare the area it is necessary to remove all weeds and shape the ground. Thyme will not compete with weeds and, if the ground is mounded in spots, the end result will be mounds throughout your landscape. As the thyme knits together over the ground, it will help to keep annual weed seeds from getting light causing them to die. Weeds or grasses that run underground will be a huge problem if not dealt with before planting. Ground Cover Thyme will not keep these aggressive weeds from taking over and all weeds should continue to be removed from the thyme as it grows into new areas. If soil is amended or graded in preparation, it will need to be watered several times so the soil settles. The soil should not be fluffy or the plants will "float" when they first go into the ground. At this point it is also necessary to determine how the plants will be watered. Thyme is very shallowly rooted and can dry out quickly, especially when the little plants are first transplanted. Thymes should remain moist but not soggy for best growth. Over head sprinklers, drip or hand watering can be used, as long as the entire area receives water allowing the stems to root in moist soil. Once you decide what you will use to water, then you need to decide how far apart the thymes will be planted. This is especially important if you are using a drip system. Two things to consider are economics (how much do you want to spend) and patience (how long are you willing to wait for the thyme to spread). One plant will cover everything if you wait long enough. Normally, we recommend the same spacing for plugs and pots. Flagstone Filler Thymes go in at about every 4-6 inches and Ground Cover Thymes go in about every 12 to 18 inches. The closer they are planted the faster the ground will be covered. PLANTING AND MAINTAINING GROUND COVER THYMES
The hole in the ground should be just deep enough to bury the plant at the same level it was buried in in its original container. Firm the plants into their hole by gently tapping down the ground around the plant. Making good root contact with the soil around it will help the Thyme to take off faster. Keeping plants moist, especially their root zone, after planting is extremely important. If the soil around the root ball is too dry it will wick water away from the plant causing dehydration of the root zone. It is necessary to keep the root balls moist until the roots start to grow into the soil around them. Mulching the bare ground when the Thyme is first planted helps to retain moisture and get the plants off to a successful start. Mulching also helps to keep weeds at bay. A small particle mulch requires about a three-inch depth covering the bare soil around the new plants. The larger the mulch particles, the deeper the mulch should be. Avoid mulching right around the thyme. An airspace of about three-inches around the plant will keep it from being composted by the mulch. In six months or so, mulches may need to reapplied as they decompose and start to show bare dirt. The idea is to keep weed seeds from getting the light they need to sprout. The photos below show how the bare ground around the Pink Lemonade Thyme was kept mulched. |
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| Normally, Thymes don't require fertilizer or pruning. They may be pruned away from other plants once or twice a year. Pruning too often causes plants to produce few leaves and exposes woody stems. Low mowing is not recommended but spent flower stems could be removed by a mower set at two or there inches high or a high pass with a weed eater. | |||
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Ground Cover Thyme Plug Trays These small cells of well rooted plants are ideal for planting between stepping stones. Each cell is about an inch long and 3/4 of an inch wide. There are 128 of all the same plan tin each tray. Heretus Thyme is pictured.
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