The daylily is a hardy perennial plant with an unstoppable tuberous root called a rhizome. All Rights Reserved. For severe infestations, you may have to resort to using pesticides. Results can appear up to two weeks. Digging up a patch of wild daylilies—or ditch lilies—is back breaking work and may not be enough to kill them completely. Selective herbicides designed for use with daylilies (Hemerocallis) provide effective control of unwanted grasses without damaging your flowers. A "strong" mixture of 2,4-D will kill everything. If you are using concentrate, proper dilution is important. At the current stage of our knowledge, it is safest to assume that if any daylily foliage remains green through the winter in an already infected garden, there is a possibility the rust could survive inside those leaves. She would like to start over and plant something else there instead. Aphids on Daylilies - ladybugs are good natural predators for aphids, insecticidal soap is an effective organic way used as a spray, by spraying both sides of the leaves, it is best if you rinse off the soap after a few hours after applying it, so the leaves are dry before dark. If you are not able to dig them out, you're going to have to kill them with a chemical that will be absorbed by the leaves and kill the roots. Herbicides can destroy and kill anything that it is able to coat, so make sure to keep them away from plants that are important to you. I am guessing yours are from roots. Susceptibility varies among cultivars. Mint needs alkaline soil to grow and the acid will kill the leaves and leech into the soil. Use biological control like lacewing, ladybugs or pirate bugs destroys the insect in different stages of the life cycle. Be sure to cover the entire area and a couple feet beyond to keep the unwanted daylilies from receiving sunlight. Instructions Decide on the areas of daylilies to be killed. However, make sure that you use it carefully. Black, sooty mold grows on honeydew, and the fungus hampers photosynthesis, leaving unsightly dark spots on plants. Depending on the size of your daylily problem, you may be able to dig them out by hand and discard them in plastic bags. How to control: Cut brown leaves off to the ground and get rid of the leaf debris to remove the source of spring infection. If these flowers are growing in an area that cannot be mowed, you may try using a string trimmer instead. Here are 11 tips for making rust unwelcome in your garden: 1. I have 50 foot daylily garden along my fence that had random ditch lilies popping up. Be sure to cover the entire area and a couple feet beyond to keep the unwanted daylilies from receiving sunlight. Leave the mulch in place for one year to completely kill off the daylilies underneath. There is literally no room there except for this daylily and it is spreading like crazy, even across the concrete walkway to the other side! Our expert reviewed outdoor products ensure you are getting the right equipment for your lawn and garden. Daylilies spread through underground rhizomes and require division every three to four years to keep the plants vigorous. Trash or burn the leaves. Though many gardeners relish the beautiful orange and yellow blooms of the daylily, the plant can turn into a wild nuisance and spread into unwanted areas. An inch of water per week is plenty. They live in large colonies under leaves and in buds, and they pierce plants with their mouth parts to suck the sap out of daylilies. Daylilies with leaf streak may initially show very little signs of infection. Daylilies may look great on your garden because of their bright orange and yellow colors, the plant can actually begin to grow in a bothersome way and begin to spread in various and probably even unwanted areas in your garden. Plant in a sunny location, with at least six hours of direct sunlight per day. Cover the area with a plastic weed barrier. This way, the daylilies will not be able to receive sunlight, which will eventually kill the plants themselves. Menu Ask a Question Share a Post Account Search. Do not compost. Leaf streak is a fungal disease that affects daylily leaves during wet periods in spring. Spray mint with vinegar or other acetic acid using a household spray bottle. If all of these types of methods fail, you can use a handy weed killer. Plus, there are thousands of beautiful daylilies to choose from. However, keep in mind that daylilies will probably try to go back through the mulch itself, so it is important to reapply mulch again if you see any green parts growing back through them. Mow the area where the daylilies you want to kill are growing. Mint and daylilies each tolerate a wide range of growing conditions, but boiling water will scald plant tissue and cook roots. Killing unwanted daylilies takes patience and a time, but it can be accomplished. This will also prevent sunlight from being absorbed by the plants. Make sure to carefully comb the soil of all the little bits of root or tubers and tightly seal the bags you’re using for disposal. Any segment of daylily root left behind can spawn new growth. Choose daylily varieties that are disease-resistant. This is a guide about getting rid of day lilies. In case of severe attacks, use botanical insecticides. Share. Also check your soil if there are any remains of the roots of tubers as well. 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