Yard and Garden: April 27, 2018

Y&G Blog Photo, 2018

This is the Q&A for the Yard and Garden show for April 27, 2018. 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 August 3, 2018. 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: Dick Campbell, Owner of Campbell’s Nursery in Lincoln

1.The first caller of the show wants to plant hydrangea’s on the south side of a porch. Will they grow well in that location?

A. Most hydrangeas like part shade and wouldn’t grow as well in a location of south sun. However, ‘Limelight’ and ‘Little Lime’ would be good selections for full sun. The ‘Little Lime’ hydrangea will only grow up to 3 feet tall while ‘Limelight’ will grow up to 6-8 feet tall.

2. A walk-in listener has a 12 year old boxwood that is turning whitish-brown throughout most of the plant. What, if anything, can be done to save the plant?

A. This could be boxwood blight or winter desiccation. The fact that the boxwoods started to turn brown in the summer makes it less likely that it is winter desiccation. Also, the plant is brown and dead throughout the majority of the center of the plant, where winter desiccation typically only shows up on the top and outer sides where wind directly hits the plant. Either way, too much of the shrub has become dead branches so it should be removed. Boxwoods can be replanted into the area where the blight was a problem previously with no harm to the new plants.

3. A caller has Dwarf Alberta Spruce trees that have brown spots on them. Last summer he sprayed the plants with a copper fungicide, but should something else be done to them?

A. Dwarf Alberta spruce is prone to problems with spider mites in the summer months. If it is spider mites, when they start becoming active again, they can be killed with a strong spray of water. The bigger problem is that this is a very slow growing tree and it may never fill in again where the dead areas have appeared in the trees.

4. This caller has pecan trees that the top has died back on them over the winter. Can he prune it out and maintain the trees?

A. Give the trees time to leaf out this summer to know for sure where the dieback is found through the tree. With the cooler spring this year, many of our plants are slow to come out of their dormancy. Wait until the tree is fully out of dormancy before pruning it. After it has leafed out fully, cut the dead areas out, but cut back to a bud at the top of the tree so that you can use that bud to reestablish a new leader.

5. A caller has underground irrigation and planted a new lawn via seed and some via sod last fall. What type of watering schedule should he be on now?

A. Because this lawn was established last fall, you would not need to keep up the same schedule as last fall, the roots should be established now. Wait to start up the irrigation after spring rains begin. 1 inch of water per week would be the recommendation now, that is what established lawns require, so it would be the same for this lawn. Most often, we give our lawns 1 inch of water per week through 3 irrigation cycles of 1/3 inch each time. Make sure you check your irrigation rates when you first turn your system on for the year.

6. This caller has a 25-30 foot tall red oak in his yard. Every year for the past 2-3 years, the leaves come out cupped and small and stay that way through the entire growing season. What is wrong with his tree? He has other oaks in his yard that don’t look like this.

A. The cupping leaves sounds similar to herbicide drift. Typically, though, the trees will grow more leaves later in the season that are not cupped. If this was herbicide damage, it is likely that all the oaks in the yard would have this problem, but it still could be herbicide damage. It could also be from a small mite or other insect that is sucking the juices out of the leaves as they emerge. It would be best to bring a sample to the show or to Nicole to take to the lab for further testing. If it is herbicide damage, multiple years with damage to a tree can start to stress and kill a tree.

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Henbit blooming

7. A caller has a zoysiagrass lawn that is full of henbit for the first time this year. Is there anything to do for that now?

A. Henbit is blooming for the year now, which means it is already setting seed for more henbit to grow there next year. Henbit is a winter annual that germinates in the fall, goes dormant over the winter, then comes up in the spring and flowers and produces seed before it dies with the summer warmth. Because it is getting so late in the year and the seed is already there, there is no reason to treat for henbit now. It will die soon, once the temperatures warm up. next fall, treat with a 2,4-D product in October or November to kill it as it first germinates in the fall.

8. How do you control Creeping Charlie in the lawn?

A. Creeping Charlie is best controlled in the fall months with a 2,4-D product or a product containing Triclopyr. It is best to do 2 applications in the fall, one in the middle of September and another at the end of October. The caller was going to overseed, so it was advised to overseed this spring and then treat the Creeping Charlie in the fall for best control. It will take multiple years of treatments to fully reduce or eradicate Creeping Charlie, but spraying in the fall will start knocking it back.

9. This caller has Sod that was installed last November and now some cracks have shown up between the sections of the turf. What can be done to fix that?

A. Add some soil to those areas of bare ground and then reseed those areas. Cover the new seed with peat moss while it establishes to keep it moist.

10. A caller wants to know how to plant strawberries and what varieties are good choices?

A. Sarah Browning, Lancaster County Extension, has written a good article on Planting a Strawberry Bed

11. The last caller of the day wanted to know if they should till their garden before planting and when to prune her hydrangea shrub?

A. If the soil is loose and has a good level of nutrients, you wouldn’t have to till it first. It might be a good idea to till it first to loosen it up and to add nutrients back into the soil for better production.

As for the hydrangea, this is a late summer blooming hydrangea, so it can be pruned now and still produce flower blooms for August or September this year. It can be pruned back to the ground if it is overgrown. If it is not too overgrown, the largest canes can just be cut out of the plant, leaving the more productive, smaller canes in the plant to grow.

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Yard and Garden: June 10, 2016

Yard & Garden for blogThis is the Q&A for the Yard and Garden show for June 10, 2016. 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 August 5, 2016. 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: Paul Hay, Gage County Extension

1. The first caller of the day has a small Dwarf Alberta Spruce that is turning brown. What would cause this?

A. This would be from spider mites. This particular tree species is very susceptible to spider mites. They can be controlled with a strong spray of water or insecticidal soaps, horticultural oils, or a general insecticide such as a permethrin product.

2. This caller wanted to know if it was still ok to apply the second fertilizer application for the lawn?

A. Yes, you can do one around Memorial Day. I would suggest waiting until after this heat wave passes through and make sure the lawn is well-watered when you do fertilize, so you don’t fertilize to a drought-stressed plant which can cause leaf burn.

3. What would cause Clematis leaves to turn yellow, the plants still bloomed fine this year?

A. Clematis has a problem with Iron chlorosis. This could be iron chlorosis which can be treated with an iron fertilizer.

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Squash bugs on zucchini

4. A caller wanted to know what the best control for squash bugs in the garden would be?

A. Squash bugs will become active soon. Look on the underside of the leaves of your cucurbit plants such as cucumber, zucchini, squash, pumpkins, and melons. Squash bugs lay their eggs on the underside of the leaves. If you find the eggs, squash the eggs or remove the leaves. You can also spray for them. Spray on a rotation of every 10-14 days throughout the growing season. Switch between at least 2 of the following: sevin, eight, or bifenthrin.

5. This caller has rocks near the lawn and near some trees. There are weeds growing up through the rocks. Can glyphosate, or Roundup, be used around these trees?

A. If the trees are not close enough to be spraying directly on the trunk or leaves, then it will be fine. Glyphosate is not mobile through the soil like some chemicals.

6. This caller wanted to know what to do about the gnats outside? He cannot go outside right now without being attacked by gnats.

A. There is no longterm cure for gnats, much like mosquitoes. Using bug sprays, especially those containing DEET, will help the most. If you have an outdoor event coming up, you can treat the lawn and surrounding plants with sevin or other general insecticide, but these will not last for more than 2-3 days.

7. Is it too late to plant sweet potatoes? What can you do about grasshoppers in the landscape?

A. No, it is not too late to plant sweet potatoes. This is a warm season crop that really doesn’t like the early spring planting. They will do fine if planted in late May to early June. For grasshoppers in the landscape, they can be sprayed with any general insecticide. If in or nearby the vegetable garden use sevin, eight, or bifenthrin for safety of the produce. Be sure to spray the insecticides in the ditch, roadside, and fence rows where grasshoppers are found in high numbers.

8.  This caller has hemlock in the pasture. Is it poisonous? How can he control it so his cattle don’t eat it?

A. Yes, poison hemlock is poisonous if eaten, not if it is touched. Cattle can be poisoned by it, but they typically don’t eat the poison hemlock if there is an alternate food source. Use 2,4-D or Grazon in the pasture to control poison hemlock or dig it out.

*Don’t use 2,4-D this late in the season around landscape plants and never use Grazon or other products that contain Tordon in a landscape setting.

9. A caller has common mullein in his pasture. How can it be controlled?

A. Common mullein is best controlled with 2,4-D or Grazon. Make sure you spray down into the heart of the plant to get the chemical past the hairy leaves. It is best to spray the smaller plants, it would be too late to spray the larger plants that already have a flower stalk on them. Removal of the flower stalks will help reduce seed production from the full grown plants.

10. This caller has a 16 foot river birch that was planted last fall. Now the leaves have turned yellow and are beginning to fall off of the tree. Can it get too much water? What would cause this problem? She hasn’t been watering the tree much yet since it was planted in the fall.

A. Yes, plants can be overwatered to cause death. Newly planted trees need to be watered because they have no root system developed. A tree that was transplanted at this large of a size is going to have a great deal of transplant shock to overcome. Water was sitting in the hole when the tree was planted, so there may be an issue with water draining from the location. Use a probe or long screwdriver to see if the tree needs water. Push the probe into the soil 12-18 inches, if it goes in easy it doesn’t need water, if it is hard to push the probe in very far, the tree needs to be watered.

11. The final caller of the day wanted to install an electronic timer for watering his garden. What would be the best time to set his timer to water his garden?

A. 4 am-10 am is the best time to water any plants. This helps to water the plants while they are already wet from the dew period. It also helps to water early in the day so that the plants will dry out before night. Plants that are wet and cooler overnight introduce a great environment for diseases to occur. To reduce diseases, it is best to water early in the morning.