Yard and Garden: July 21, 2017

Yard & Garden for blog, 2017

This is the Q&A for the Yard and Garden show for July 21, 2017. Yard and Garden Live is a call-in radio show I do on KUTT 99.5 FM from 10-11:30 am and it will run through July 28, 2017. It can also be found on kutt995.com for online listening. If you missed a show or just want to read through the questions, I have written them all in my blog and will continue to do so throughout the season.

Guest Host: Sarah Browning, Nebraska Extension Educator in Lancaster County

If you enjoy reading my Q&A from the show each week, take my quick survey at: http://go.unl.edu/44qr and be entered to win a free plant book or some free UNL gifts.

1.The first caller of the day wants to know how soon they should spray for fleas outside for an upcoming camping outing?

A. Sprays for fleas will last a couple of weeks, so it would be most beneficial to spray a week ahead of the event. Using a product containing permethrin or bifenthrin would be the best control.

2. A caller has hydrangeas that are healthy looking and green but they are not blooming, why is this?

A. This could be due to a few different factors. It could be that the plant is just slow to bloom this year due to environmental factors. Give the plant time to see if it does bloom. If the lawn surrounding the plant is highly fertilized, it may be that some of the fertilizer got into the rootzone of the hydrangea plants. Lawn fertilizers are high in Nitrogen and will cause the plant to grow nice, large, green leaves without putting any energy into producing flowers. If this is the case, make sure that you stay back away from the hydrangea next year when fertilizing the lawn. Finally, this could also be due to the plants being crowded and needing to be divided to allow the plants room to develop fully and produce flowers.

3. This caller has lilac shrubs that had not bloomed for the past few years but now this year it did finally bloom. What would cause that and how can she ensure that they bloom every year?

A. The fact that they bloomed again this year is hopeful. If lilacs are pruned at the wrong time of the year, such as in the fall or early spring, the buds will be cut off when this is done. However, the caller said she has not been pruning them at all. This could be due to the lilacs getting overgrown and having old, unproductive wood in the shrubs. It might be best to try to do a rejuvenation cutting to start all of the branches off new again. With a rejuvenation cutting, the entire plant is cut off about 6-8 inches above ground level removing all diseased, dead, and weak wood from the plant.

4. When do you divide lilac shrubs?

A. This is a woody shrub and we don’t typically divide woody shrubs due to the way that they grow. However, you can dig up the suckers that grow off the main plant and pull them out and plant them in a new location. The best time to do this replanting would be in later September when the temperatures have cooled off.

5. A caller has mum plants that have leaves that are shriveling up and turning yellow. There is only a couple of the plants on each side of her house out of a large group of mums that are not as full and not doing as well as the others. She hand-waters every day.

A. Watering daily could lead to a root rot. The roots need time to dry out between waterings. If it is a root rot, there is nothing that can be done to fix the damage already done and the plants will likely die.

6. This caller has a Rose of Sharon that is not blooming. It is planted in a location with minimal sunlight, would it be in too much shade?

A. Yes, Rose of Sharon bushes need full sunlight and will not bloom if in too much shade. This fall would be a great time to move it to a location with full sun.

7. A caller has cucumber plants with brown spots on the leaves. What would cause this and how can she avoid it killing her plant quickly like it did last year?

A. This could be a fungal disease common in cucumbers this year such as anthracnose or alternaria. Fungicides are not usually recommended in home vegetable gardens because they are typically not necessary or worth the time and money. However, if this disease quickly killed your plants last year, you could spray them with a liquid copper fungicide to keep the disease from spreading this year and killing your plants again. If they died quickly, it could also be from squash vine borer or squash bugs which can kill a plant almost overnight. Spray with a general insecticide for these insects such as sevin, eight, or bifenthrin. Wait the proper amount of days after spraying chemicals before harvesting vegetables. This time will be on the label as the PHI, or post-harvest interval.

8. This caller has a cherry tree that has a white fungus growing out of the trunk of the tree. There are no leaves on the branches in the middle of the tree and it hasn’t produced any fruit this year. What is wrong with the tree?

A. This is a shelf fungi, also called conks, appearing on the tree. Shelf fungi are the outward appearance of interior decay within the tree. When shelf fungi appear on the tree, the tree is dying and should be removed.

9. A caller has a burning bush that is growing up against the deck and some of the branches are dying in the center of the bush. Can it be pruned to remove the dead wood and to cut it back so it doesn’t block the deck? If so, when can it be pruned?

A. You can remove dead branches anytime, healthy branches should be pruned back in the late fall to late winter. The branches may be dying out due to scale insects which can get on the branches and reduce the vigor in the branches they are living on. If you find scale insect, use a systemic insecticide such as one containing imidacloprid in the early spring.

 

Dog vomit fungus

Dog Vomit Fungus

10. This caller remulched their garden this spring with a wood chip mulch. Now there is a cream colored substance on the mulch that looks like cat vomit, but they have no cats. What is this?

A. This is dog vomit fungus. It is a fungal structure much like a mushroom or puffball. It is not harmful to the plants or the mulch. It can be found on mulch because it lives on decaying organic matter such as the woodchips. It is nothing to be worried about and if you don’t like the way it looks, you can wash it off with the jet setting on your hose end sprayer.

11. A caller has a prairie area where he is trying to grow a mix of wildflowers and native grasses. However, Marestail is growing in among the desirable plants. How can he control the broadleaf weeds and not kill his desired broadleaves and grasses?

A. Once the grasses and wildflowers thicken up in the prairie, they will push out the weeds, but establishment is the hardest part. Mowing this year will help to thicken up the plants growing there and will stop seed production in the marestail which is an annual weed.

12. This caller is also starting a prairie area. He has had a 2 acre pasture of alfalfa that he now wants to change over to native grasses. What is the best method of doing this?

A. The native grasses are mostly warm season grasses, so they are best planted in the end of May to the beginning of June. Dormant seeding could be done in late November, but you need to prepare the area this fall before a dormant seeding is done. To prepare the soil, kill the existing plants this fall and clean up and aerate the soil prior to planting. You can drill the seeds in when the time comes as well.

13. A caller has an area where soil was added and leveled off. How do they overseed the area that has been overtaken by weeds at this point?

A. Spray the area with roundup to kill the weeds. You can spray now and again shortly before seeding the area. Then overseed in September with a Kentucky bluegrass or Turf-type tall fescue. Once you overseed, use a rake to get the seed to contact the soil and keep it well watered.

14. This caller has an oak tree that is not fully leafed out, the top is bare and the lower leaves are smaller. What is wrong with the tree?

A. This could be due to herbicide drift since many neighboring trees look similar. If so, there is nothing to do to fix herbicide drift once it has been done, just make sure the tree is being watered and that it is mulched in. This could also be due to the fact that the tree isn’t getting enough deep water if it is just being watered by the turf irriagation. Make sure that once every 10-14 days a slow, long irrigation is done around the tree. Trees need water down to 12-18 inches deep, lawn irrigation only waters the top 4-6 inches of the soil.

15. A caller has 2 large Norway pines. How can he get grass to grow under the trees?

A. Unfortunately, grass will not grow in heavy shade under a large tree. It would be best to try a groundcover, sedge plants, or shade perennial plants. We often continue to battle grass problems and overseeding in heavy shade, but the reason the grass won’t grow is because it is not meant to be grown in shade. In these situations it is best to find other plants that are more suited to the shade or just mulch around the tree to stop weeds from growing around the tree.

16. The last caller of the day has dwarf lilacs that are quite large. How tall are they supposed to grow?

A. Dwarf lilacs, such as the Miss Kim variety, will still grow up to 6 feet tall if left unmanaged. This is still much smaller than the full sized-lilacs which grow up to 15 feet tall. You can continually prune these lilacs in the spring after they finish blooming to keep them to a smaller size. Prune within the couple of weeks after blooming so you don’t cut any flower buds off.

Yard and Garden: June 2, 2017

Yard & Garden for blog, 2017

This is the Q&A for the Yard and Garden show for June 2, 2017. Yard and Garden Live is a call-in radio show I do on KUTT 99.5 FM from 10-11:30 am and it will run through July 28, 2017. It can also be found on kutt995.com for online listening. If you missed a show or just want to read through the questions, I have written them all in my blog and will continue to do so throughout the season.

Guest Host: Graham Herbst, Community Forester from the Nebraska Forest Service

If you enjoy reading my Q&A from the show each week, take my quick survey at: http://go.unl.edu/44qr and be entered to win a free plant book or some free UNL gifts.

1. The first caller of the day has a Hen and Chicks plant that has grass growing in it. What can be done to remove the grass? She also has spiders in her lawn, what can she do to control them?

A. Grass-B-Gon is a product that contains the active ingredient Fluazifop. This is a grass herbicide. This product or any others containing Fluazifop can be sprayed directly over broadleaf plants with no damage to the desired plant. The spiders are not an issue outside in the lawn, in fact, they are beneficial. Spiders in the lawn are feeding on insects, many of which cause problems to our plants or bother us. Outside, spiders are beneficial. To keep them from coming indoors, home barrier sprays or tempo can be used around the foundation of the house to keep spiders and insects outside. If there is a fear of spiders, the tempo could be used where the spiders are seen.

2. A caller has a mock orange that has not bloomed for the past few years and now this year it finally is blooming some. Should it be removed? Why hasn’t it been blooming?

A. This could be due to a maturity issue. Many of our woody plants need to become established and get to a certain age before they will begin blooming. It could also be due to pruning time. Mock Orange bushes need to be pruned right after they finish blooming because they bloom on last years growth, or old wood. If they are pruned in the fall or early spring, the blooms would be cut off.

3. When is the proper time to spray for bagworms on blue spruce trees?

A.Spray when the bags are small to get the best control. It is best to spray after the bags emerge in the late spring to early summer but before the bags get longer than 1 inch in length. Mark a branch with a bag on it now and keep checking it to determine when the bags have emerged.

4. A caller has 6 table grape plants that had grapes set on. Now the grapes are dropping off and 70% are gone from the plants. What has caused these plants to loose all of the grapes?

A. This could be due to frost damage. Here is a guide from Oregon State University to describe the many factors that can hinder fruit development in grapes.

Forsythia-Richard Elzey, Flickr

Forsythia, Flickr image courtesy of Richard Elzey per CC license

5. Is it too late to prune forsythia this year?

A. It is too late to prune and not cut off any blooms for next year. Spring blooming shrubs should be pruned shortly after they finish blooming for the year. Forsythias bloomed in March this year, so it would already be starting the formation of flower blooms for next year, pruning them now would cut those buds off. If the intent is to just prune a few branches just a little, it wouldn’t impact the overall blooming of the shrub, but pruning too heavily will lead to little or no development of flowers.

6. A caller wondered where they could go to find the wrap around water bags for trees?

A. Local nurseries should carry them or there are many online locations where you can order them. These bags are beneficial to help keep the root ball moist to help get new trees established.

7. Can Grass-B-Gon be used in strawberries or phlox and will preen reduce the number of runners grown off of strawberry plants?

A. Grass-B-Gon is not labeled for use in fruit bearing tree crops and vines. So, it cannot be used in strawberry plants. It would be good to use for grasses growing in phlox and not cause any harm to the phlox. Preen stops the germination of seed to reduce weeds grown from seed in the garden, so it will not harm runners which are growing off an existing plant, not from seed. Check to make sure the preen you are using is labeled for use in strawberries, the general preen is not for use in vegetable gardens.

8. How do you transplant a wild rose?

A. First, make sure it is on your property. Then, just make sure you dig up as much of the rootball as possible and replant it right away. You could also try taking a cutting from one of the branches and dipping it into rooting hormone and placing it into a pot of gravel to get roots to grow. Once roots develop, you can plant the rose.

9. A caller wants to build a privacy border with shrubs. Would Burning bush work for this or are there other options to choose from?

A. Burning bush would be a great privacy wall with good fall color. Other shrub choices would include serviceberry or any of the viburnums. You could plant it now, just make sure the plants get plenty of water with it being this hot and the roots being minimized due to transplanting.

10. This caller has tomato plants that when they planted it they saw grubs and wireworms in the soil around it. Should they treat for this and if so, what should be used?

A. Grubs are not controlled effectively around vegetable gardens because the chemicals with the best control are not labeled for use in the vegetable garden. However, there is a fairly high threshold of grubs and wireworms in the garden before damage is too high. A few grubs or wireworms throughout an entire garden will not cause any real damage. The plants they are most problematic on would be the root crops such as potatoes.

11. This caller had 2 questions: Her asparagus has been planted in this location for 30 years and is quite spindly, why is that? Her peonies are done blooming now, can she deadhead the spent flowers?

A. The asparagus is regularly fertilized so the small spears could be due to heavy harvest or it could be getting old or too crowded. It would be time this year to stop harvesting to allow the plants to recover and make sure to stop sooner next year. Once peonies and iris plants have completed their blooming period, the flowers can be cut off and composted. Leave the leaf material on the plant to build sugars to help with the flowering next spring.

12. How do you control weeds in asparagus?

A. Hand pulling and mulch would be the best options for weed control. When the plant is done in the fall and the leafy material is all removed below the ground level, the existing weeds can be sprayed with Roundup as long as no green material from the asparagus is above ground or showing. Here is a good explanation from Backyard Farmer of why we don’t use salt on asparagus for weeds and how to effectively control weeds with Roundup.

Carpenter Bee, J. Kalisch

Carpenter Bee photo from Jim Kalisch, UNL Entomology

13. A caller has carpenter bees digging holes into the roof of a patio. What can be done about this?

A. You can plug those holes with caulk or putty or use a sevin dust in the holes. For more information on Carpenter Bees, see this article from Retired Extension Educator, Barb Ogg

14. This caller has puncture vine in the lawn. What can be used to control it?

A. 2,4-D is a good way to control it in the the spring before it blooms.

15. A caller has peonies that need to be transplanted. Can they also be divided when they are transplanted?

A. Yes, they can be cut into a few pieces when they are transplanted this fall. Just make sure that each section you cut off the plant has 3-5 eyes which are more like pink noses or knobs on the roots of the plant. Peonies are best transplanted and divided in September or October.