When to Plant Thompson Seedless Grapes?

Soil Temperature

• Thompson seedless grapes can tolerate temperatures as low as -10 degrees Fahrenheit, although they may lose their fruit buds at this temperature. The average minimum temperatures in climate zones 7 through 9 are between 0 and 30 degrees Fahrenheit. Even though these plants can withstand freezing temperatures, you must wait until the soil thaws sufficiently to dig and prepare the planting hole. The best time to plant these grape vines is as soon as you can work the soil in the spring.

Soil Texture

• Soil moisture and texture also play a role in determining the correct planting time. The soil should be workable and slightly dry, not wet. Wet soil tends to clump and can harden around the young roots. Snow melt and early spring rains can lead to periods of soggy soil. Depending on the amount of precipitation in your area, you may need to wait for the soil to dry out before planting.

Location

• Thompson seedless grapes grow best in areas with full sunlight, such as along the southern side of buildings and windbreaks. These locations often experience an earlier thaw and subsequent warming. These warmer locations in the yard or landscape are usually ready to plant earlier than locations that receive shade during the early spring.

Planting

• These grapes require a soil pH between 5.8 and 6.5. A soil test provides valuable information regarding the existing state of your soil, as well as suggesting methods of treating poor soils. Good drainage is the most important factor in planting grapes. While they grow in both rocky and loamy soils, the porosity of the soil should encourage good drainage. Adding peat or compost can help increase the drainage rate of heavy, shallow soils.