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What's wrong with this rose bush? A lesson in irrigation

Check drip system is working when plant shows sign of dehydration

Sacramento Digs Gardening
BY Debbie Arrington PUBLISHED SEP 6, 2023

This poor Oklahoma hybrid tea rose bush needs some water, and stat! Photo courtesy reader Brent T.

Brent T. of Folsom had a not-so-rosy dilemma. In late summer, a once-healthy Oklahoma hybrid tea rose bush had turned brown and crispy. Another Oklahoma rose planted across his backyard was doing perfectly fine.

Brent sent a photo for diagnosis. His rose issues stemmed from what could not be seen – and serves as a reminder: Don’t assume a plant is getting enough water just because it’s on drip irrigation. Emitters can become clogged or fail. Roots can interrupt drip lines. (So can critters!)

When a rose or other plant shows signs of dehydration and distress, check the soil. If it’s dry and cracked on top, it definitely has irrigation issues. If you can’t plunge a 6-inch screwdriver into the dirt, it’s time to deep water.

“Give this poor bush some water quick!” I advised Brent after seeing the bush’s photo. “It's sunburned and badly dehydrated. It may also be suffering from foliage burn (which is different from sunburn).

“It also looks like it's infested with spider mites, another sign of dry and dusty conditions.”

Brent confirmed that the bush was on drip irrigation and that likely was the root of the problem.

But how do you return the plant to health?

Start by washing the bush off with a hose; spray it all over to clean off the dust and knock off the little webs of the spider mites.

Then, give the bush a deep and thorough soaking. Saturate its bed, then let the water soak into the ground.

Next, cover the ground with wood chips, bark, dried leaves or other organic mulch (not rocks). That will help keep the soil and roots cooler while retaining moisture.

Sunburn usually happens when bushes are exposed to too much blasting heat – that’s common in Sacramento and especially affects plants growing near concrete driveway, walls or sidewalks. That hardscape reflects more heat. A sunburned bush will shed damaged leaves and recover, as long as it has enough water.

Foliage burn happens when time-release or other fertilizer is introduced to the soil and there's not enough water for the roots to process it. The plant pulls moisture out of its foliage and sends it to the roots so it can pick up those nutrients. But in the process, the foliage looks burned – it's crispy and brown. If you use time-release fertilizer, soil needs to stay evenly moist. (Mulch helps with that, too.) Always deep water BEFORE adding fertilizer and feeding plants.

With a little TLC, water and mulch, Brent’s Oklahoma should be good as new.

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Keywords:

roses heat sunburn irrigation Sacramento gardening flowers soil moisture mulch fertilizer

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Garden checklist for week of May 17

With an eye on warmer weather to come, continue to work on the summer vegetable garden:

* Remember to irrigate your tender transplants. The wind can quickly dry out young plants. Seedlings need consistent moisture. Deep watering will help build strong roots and healthy plants. Water early in the morning for best results.

* Plant, plant, plant! It’s prime planting season in the Sacramento area. Time to set out those tomato transplants along with peppers and eggplants. Pinch off any flowers on new transplants to make them concentrate on establishing roots instead of setting premature fruit.

* Direct-seed melons, cucumbers, summer squash, corn, radishes, pumpkins and annual herbs such as basil.

* Harvest lettuce, peas and green onions.

* In the flower garden, direct-seed sunflowers, cosmos, salvia, zinnias, marigolds, celosia and asters. (You also can transplant seedlings for many of the same flowers.)

* Plant dahlia tubers.

* Transplant petunias, marigolds and perennial flowers such as astilbe, calibrachoa, columbine, coneflowers, coreopsis, rudbeckia and verbena.

* Keep an eye out for slugs, snails, earwigs and aphids that want to dine on tender new growth.

* Feed summer bloomers with a balanced fertilizer.

* For continued bloom, cut off spent flowers on roses as well as other flowering plants.

* Put your veggie garden on a regular diet. Set up a monthly feeding program, and keep track on your calendar. Make sure to water your garden before applying any fertilizer to prevent “burning” your plants.

* As spring-flowering shrubs finish blooming, give them a little pruning to shape them, removing old and dead wood. Lightly trim azaleas, fuchsias and marguerites for bushier plants.

* Don’t forget to weed! Those invaders are growing fast.

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