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Key to grape success? Deep irrigation


Bunch of grapes on vine in sun
Grapes need a lot of sun and water for best results. (Photos: Debbie Arrington )


Vines require a lot of water, sun for best harvest



Are your grapes getting enough water?

Summer irrigation is crucial for a good harvest. Grape vines may adapt to drought conditions and low water supply, but they’ll bear a lot fewer if any grapes.

According to the UC Cooperative Extension master gardeners, grapes need deep irrigation every two weeks during these hot summer months (or more if the heat is particularly brutal). Give vines a slow, deep soaking that fills their root zone.

Drip irrigation works well with grapes, but remember, they need a lot of water. According to the master gardeners, each mature trellised vine needs 8 to 10 gallons a day. Less vigorous or young vines still need 6 to 8 gallons daily. (By comparison, a tomato plant requires about 5 gallons of water a week.)

Consistent irrigation will prevent several grape problems.

“Avoid water stress during the period between bloom and berry softening,” say the master gardeners. “Fruit on the vine may succumb to cracking if the vines are allowed to dry and then wet again. Check the soil profile to be sure the plants are getting adequate water but not too much.”

Thirsty vines don’t like a feast-or-famine water cycle. For nice plump grapes, keep the soil evenly moist. Use a moisture meter, a soil probe or just look – with a trowel, dig down a few inches.

Grapes require sun for sweetness. Although vines may produce grapes in shady spots, the plant needs at least eight hours a day of full sun for the grapes to produce enough sugar to taste “sweet.”

Grape bunch in shade on vine
Grapes that ripen in shade tend to be less sweet.

Sunlight on the fruit can bring out the grape’s sweetness and color (especially red varieties). That’s why vineyards may snip off leaves shading grape clusters. Grapes ripened in the sun tend to be sweeter than those that ripen on the shady side of the plant. But clusters still need some afternoon shade or the grapes can become sunburned.

When to pick? Grapes ripen on their own schedule and may look ready before they actually are at their sweetest. The only way to tell is test. Pick a plump grape and taste it. If it’s not sweet, wait a few days, then test again.

For loads of great grape advice, check out the UCCE grape page:
http://ipm.ucanr.edu/PMG/GARDEN/FRUIT/grapes.html

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Garden checklist for week of May 24

Take advantage of this “normal” week and get stuff done. Your garden needs you.

* 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.

* Support with trellises, cages or stakes rapidly growing tomatoes, peppers, eggplants or other tall crops that may get knocked around in those gusty winds.

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

* Harvest cabbage, 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, columbine, coneflowers, coreopsis, dahlias, rudbeckia and verbena.

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

* 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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Food in My Back Yard (FIMBY) Series

Lessons learned during a year of edible gardening

WINTER

Is edible gardening possible indoors?

Hints for choosing tomato seeds

Starting in seed starting

Why winter is the perfect time to plant fruit trees

When to plant? Consider staggering your transplants

How to squeeze more food into less space

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Plant a fruit tree now -- for later

Win the weed war by tackling them in winter

Tips for planting bare-root trees, shrubs and vegetables

Time to give vegetable seedlings some more space

Ways to win the fight against weeds

FALL

Dec. 16: Add asparagus to your edible garden

Dec. 9: Soggy soil and what to do about it

Dec. 2: Plant artichokes now; enjoy for years to come

Nov. 25: It's late November, and your peach tree needs spraying

Nov. 18: What to do with all those fallen leaves?

Nov. 11: Prepare now for colder weather in the edible garden

Nov. 4: Plant a pea patch for you and your garden

Oct. 27: As citrus season begins, advice for backyard growers

Oct. 20: Change is in the autumn air 

Oct. 13: We don't talk (enough) about beets

Oct. 6: Fava beans do double duty

Sept. 30: Seeds or transplants for cool-season veggies?

Sept. 23: How to prolong the fall tomato harvest 

SUMMER

Sept. 16: Time to shut it down? 

Sept. 9: How to get the most out of your pumpkin patch

Sept. 2: Summer-to-fall transition time for evaluation, planning

Aug. 26: To pick or not to pick those tomatoes?

Aug. 19: Put worms to work for you

Aug. 12: Grow food while saving water

Aug. 5: Enhance your food with edible flowers

July 29: Why won't my tomatoes turn red?

July 22: A squash plant has mosaic virus, and it's not pretty

July 15: Does this plant need water?

July 8: Tear out that sad plant or baby it? Midsummer decisions

July 1: How to grow summer salad greens

June 24:  Weird stuff that's perfectly normal

SPRING

June 17: Help pollinators help your garden

June 10: Battling early-season tomato pests

June 3: Make your own compost

May 27: Where are the bees when you need them?

May 20: How to help tomatoes thrive on hot days

May 13: Your plants can tell you more than any calendar can

May 6: Maintain soil moisture with mulch for garden success

April 29: What's (already) wrong with my tomato plants?

April 22: Should you stock up on fertilizer? (Yes!)

April 15: Grow culinary herbs in containers

April 8: When to plant summer vegetables

April 1: Don't be fooled by these garden myths

March 25: Fertilizer tips: How to 'feed' your vegetables for healthy growth