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Question of the Month

Poinsettia caution

Poinsettia

Q. Are poinsettia plants poisonous?

A.The term "poisonous plants" is often associated with plants that may cause great harm or be fatal if ingested. Potential poisoning depends on the level of toxins contained in the plant and the amount consumed.

Insect leaf damage

Caterpillar

Q. I’ve noticed many leaves of my plants look chewed. What is causing this and is there anything I can spray to help my plants? 

 A. At this time of year, many different types of insects and their larvae frequently feed on the leaves of plants. Without seeing the culprit, it is not possible to determine which insect is causing the damage to your plants. Inspect your plants thoroughly in order to positively identify the insect causing the damage.

Types of strawberries

Q. What is the difference between June-bearing and ever-bearing strawberries? 

A. Types of strawberries are named according to their harvest time. June-bearing strawberries are the most familiar type and produce the largest fruits as well as large yields. Ever-bearing plants produce two smaller crops, one in June and another in early fall. June-bearing varieties also produce larger numbers of runners than ever-bearing varieties.

Lack of flowers on lilacs

lilac

Q. Why doesn’t my lilac bloom in the spring?

A. There are several possible reasons why your lilac fails to bloom. The most common cause is lack of adequate sunlight. Lilacs (Syringa) need to be planted in a location that receives at least six hours of strong, direct sun per day. They are very tolerant of different moisture conditions as long as they are planted in well-drained soil.

Watering tips

Q. How much water do plants need to keep them healthy?

A. The amount of water plants need depends on several different factors, like type of plant, how long it’s been planted, type of soil, and location.

Using fallen leaves in the garden

Q. How can I use fallen tree leaves in my garden?

A. Shredded leaves can be used to insulate various plants in the garden during the cold winter months. When leaves are used whole they can prevent water from penetrating the root zones of plants; therefore, it is important to shred them first. If only a small amount is needed, whole leaves can easily be shredded in a garbage can using a weed whacker. It is always a good idea to wear safety goggles when using a weed whacker. If a larger amount is needed, a lawn mower can be used.

Sprinklers and irrigation systems

Q: What types of sprinklers should I be using in my garden?

A:  There are many types of irrigation devices with distribution patterns to fit different watering needs. 

Hand-held devices or watering cans are the easiest to use for containers or specimen plants that may require higher amounts of irrigation.  Screw nozzles and pressure grips with triggers are available to distribute water in a variety of ways that range from full stream to fine mist sprays. 

Trees and Shrubs Recovering from Drought

Q: My trees and shrubs struggled this year because of the drought.  Will my plants recover?
 
A:  Many plants are showing signs of distress this year due to the drought and extreme temperatures.  Scorch, browning of leaves, leaf drop, and premature fall color are commonly seen due to this year’s weather conditions. Many plants seem to be perking up with the recent rains; however, significant damage may have already occurred. Young, not yet established plants, i.e., less than 3 years old, are at greatest risk of suffering long term damage.

How to prevent mums from getting spindly

Q: Last year my mums grew tall and spindly. Is there something I can do to prevent this from happening again this year?

A:  Hardy chrysanthemum plants can grow 1 to 3 feet tall, depending on the cultivar, with a spread sometimes equal to the height. To keep them growing optimally, they should be planted in a full-sun location that receives at least six hours of direct sun per day. Plants requiring full sun that are planted in shady areas will often stretch for more sunlight and grow straggly. The soil should be well-drained and kept slightly moist.

Overwinter Mums

Q: There are so many beautiful varieties of mums at this time of year. They are supposed to be perennial, but I lose them over the winter.  Is there a trick to get mum plants to overwinter?    

Gift Plant Recommendations

Q: I'd like to give plants as gifts for the holidays. Many gift plants are treated as short-lived houseplants because they are difficult to get to rebloom or keep alive and are discarded. Can you recommend plants that are easy to grow and that will last more than one season?  

Spring Rose Care

Spring Rose Care

Q. Do I need to prune my roses in spring?

A. Early April, or when the forsythia begins to bloom, is a good time to assess how your roses came through the winter, and to determine what their pruning needs might be. Many roses require minimal pruning at this time, primarily to remove dead or winter-damaged wood, whether that is the tip of a cane, or in some cases, the entire cane.

Winter Burn

winter burn

Q. As plants in my garden begin to green and produce new growth, I've noticed that some of my evergreens are very brown. Is this a disease? What should I do?

Winter Rose Preparation

Winter Rose Preparation

Q:  Is there anything I should do now to prepare my roses for winter? 

A:  Discontinue the fertilization of roses by the first week of August, approximately. Without supplemental fertilization, the plants will begin to shut down for the summer and will begin the process of storing nutrients to best survive the harshness of winter. 

Why is phosphorus, a component of lawn fertilizer, bad for the environment?

Phosphorus is a component of most fertilizers that helps plants to grow. When too much is applied or is applied at the wrong time—such as right before it rains—most of it is washed away and ends up in the local waterways. This type of pollution is called nonpoint source pollution. It causes eutrophication (a reduction of dissolved oxygen in water bodies caused by an increase of minerals and organic nutrients) of rivers and lakes. This reduced level of oxygen in water ends up suffocating fish.

Do you have any gardening gift ideas for Mother's Day?

PHOTO: Gardening tools gift box.

A: Moms who are avid gardeners always appreciate gifts that make their lives easier or add beauty to outdoor spaces. Cut flowers are gorgeous but short-lived, so how about giving live plants? A rose bush or a potted miniature rose can be enjoyed indoors and later planted in the garden. Moms who like to cook will welcome a pretty container of fresh herbs such as basil, parsley, rosemary, thyme, sage, and oregano. Hanging baskets with colorful blooms always brighten up a spring garden.

Why is my hosta foliage turning brown?

Botrytis on hosta

A.  The cool, damp, cloudy spring we had this year is conducive to many fungal infections. Some of the more common fungal problems affecting hostas are anthracnose and botrytis. This season, Plant Information has seen many cases of hostas infected with botrytis, which can be prevalent in cool, wet weather. Botrytis on hosta first appears on foliage as water-soaked spots that begin small and increase in size. As the spots enlarge, cinnamon to dark tan rings can sometimes be seen within the lesions. Lesions can also travel down to the petiole of the plant.

Tomato plants don’t produce as much fruit

Tomato plant stress

Q. Last year, my tomato plants didn’t produce as much fruit as in past years. Why is this and is there anything that I can do about it?

A. There can be several reasons to explain low fruit production:

• Sometimes flowers drop off the plant during periods of fluctuating temperatures. Temperatures above 90 degrees Fahrenheit during the day can cause the blossoms to drop without setting fruit. If evening temperatures fall below 55 degrees, remain above 75 degrees, or if the humidity is too high, blossoms can also drop prematurely.