July Horticultural Tasks

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Annuals

If you used a slow release fertilizer in the spring to fertilizer your annuals, now is the time to reapply.  They have a four month life span, so this application will take you through the remainder of the growing season.  Pay close attention to plants in containers as they will dry out faster than will plants in the ground.  Many annuals will need to be dead headed to keep them blooming.  Pinch back coleus and impatiens to keep them from becoming leggy.

Turf

This is not the time to try to establish a new turf area.  Watch for damage from mole crickets, beetles, and chinch bugs.  Be sure to vary mowing patterns and keep grass cut a little higher now because of the heat.  Check irrigation for need of repairs or to make sure heads haven’t been misaligned and that you’re still getting the coverage needed.  Dry spots in a lawn will quickly lead to dead areas.

Perennials

Reapply slow release fertilizers to perennial plants now, too.  If you have perennials that have already finished blooming, you can often get a second bloom period out of them by dead heading them now.  This will cause them to bloom again during the late summer.  Keep an eye on aphids, spider mites, and other heat loving insects during this month.  Treat with a systemic insecticide for best results.

Roses

Do not fertilize roses this month.  However, if you have Knockout Roses, they can be cut back 1/3 to encourage new growth and set an intense display of blooms.  Japanese beetles can be a nuisance on many plants including roses at this time of year.  There’s an easy way to take of them.   Take a jar of soapy water (dish soap will do) out to the plants that Japanese beetles are feeding on.  Hold the jar beneath the beetles and tap gently on the plant.  The beetles will react by dropping off the plants and fall into your waiting jar of soapy water where they will die.  This can be done a couple of times a day for the short time that Japanese beetles are feeding on your plants.

Shrubs

 Little or nothing should be done to shrubs now.  It’s a good time to note which shrubs may be needed to be replaced in the fall when planting times comes around again.  Many conifer type shrubs are susceptible to spider mites during hot, dry summer months, in particular Dwarf Alberta Spruce.  These can not easily been seen until they’ve cause irreparable damage.  Monitor closely for webbing or discoloration of plants.


Trees

 Enjoy and appreciate the shade that trees provide during our summers.  If you have an area that gets too much sun for your liking, start thinking now about where a tree could strategically planted in the winter to cast

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Amy, who has a degree in horticulture, is a Certified Nursery Professional, Pesticide Applicator, Environmental Landscaper, Arborist, and Landscape Technician, and has been in the horticultural industry for several years as a garden center employee, lecturer, consultant, and designer. She was the recipient of the 2002 Horticulture Student of the Year award from the SC Nursery and Landscape Association. She is currently the landscape designer for the City of Columbia, and is a member of the SC Nursery and Landscape Association and the Greater Columbia Landscape Association. She has consulted on gardening articles for Columbia Metropolitan magazine and The State newspaper, appeared on ETV's “Making It Grow,” and has also been a radio guest on “The Andy Thomas Show” to answer questions on gardening.  PLEASE NOTE: Opinions expressed do not necessarily represent Jungle Taming's opinions.