Since the ground cover mrytle grows so tightly rooted, will it choke off other plants grown with it like Daylilies or Irises?
While this is a great ground cover plant, it does need to be planted with care, as it can be aggressive in some areas. However, if you place it in an area with more sun than shade, it tends to grow a bit slower, making it easier to control when mixed with other plantings. I want to say your lilies and irises will be fine with this plant, but it all depends on the growing conditions in your area and the variety grown. I have grown it without any problems, while others have had a difficult time with it.
I planted this to fill in around Prince of Wales juniper ground cover. Now I want to be rid of the periwinkle and NOTHING will kill it! It's taking over! HELP!!
The best way to get rid of it is to hand pull as much of it as you can, making sure to remove as much of the roots as you can. Once this is done, then you can treat the area with an herbicide (though be careful not to get it on any plants you want to keep).
After you treat the area with an herbicide, lay down newspaper over the area that is as least 6 pages thick (more if you can) and then lay down mulch that is at least 3" thick. This should suppress anything that remains.
I have some stale coffee in mostly unused containers. Would creeping myrtle or forsythia do well with it?
Occasional use of brewed coffee is ok for these trees/shrubs, but regular use will cause the soil to become too acidic for any plant. You can use unbrewed coffee in your garden much the same way as you would the brewed without adding too much acidity to your soil, which in many cases isn't much higher in acidity than anyway. For additional info on using coffee grounds for plants, this article will help: https://www.gardeningknowhow.com/composting/ingredients/coffee-grounds-gardening.htm
Was full of blooms 1 week then dried up. Was watered.
Creeping myrtle -- also known as periwinkle and vinca minor -- is an extremely tough plant, one of those that will grow where nothing else will. One thing that will bring it down is too much water. Here's some growing information: https://www.gardeningknowhow.com/ornamental/groundcover/periwinkle/growing-periwinkle.htm
It is susceptible to some disease, which is probably what got yours: http://www.clemson.edu/extension/hgic/pests/plant_pests/flowers/hgic2108.html
I started my crape merdel tree from a seedling .. it’s about 5 in. Tall I have brought it in doors .. it lost its leaves.. now it is starting to bud indoors. So what do I do ? I would like to plant it out doors. Not sure when to do this?
Go ahead and keep it indoors until spring. This will ensure that the plant has enough growth to be planted and survive the next winter. This article will help you care for the shrub once it is established: https://www.gardeningknowhow.com/ornamental/trees/crepe-myrtle/crepe-myrtle-care.htm
I have a beautiful row of White Vanhouttei Spirea, and would like to plant Creeping Myrtle under it, as ground cover, but not if the Creeping Myrtle will cause a problem for the Vanhouttei Spirea, as it did smother my Flax. Thank you very much, Jean
I think that your Spirea will be large enough to be unaffected by the Vinca. Just keep an eye on moisture, and nutrient levels in the soil. These articles will help: