Despite our recent (and welcome!) wet winter, it is essential that watering isn’t forgotten as the weather warms up. It doesn’t take long for the soil moisture levels to drop. By doing a visual check on your watering system, applying mulch and regular watering, your roses will be well set up for the summer.
We are often asked how much water to apply for each rose during the warmer months. As a general rule, roses require around 20 litres of water each, twice weekly, but in hotter times they should be watered at least three times weekly.
Deep soakings are highly preferable over short bursts of watering, as it encourages the root system to grow down into the soil. A good time to irrigate is first thing in the morning to avoid the plant holding moisture overnight, which has the potential for diseases to develop.
We still believe that the best way to check the roses are receiving adequate water is through the ‘spade test’. The day after a good watering, use a spade to dig out a spade’s depth of soil next to the plant and make sure there is moisture at the bottom. If there is not enough moisture, consider leaving the drippers or overhead sprays on for a longer period, to ensure the plant is receiving enough water where it matters – the root ball.
Of course the water pressure, dripper or overhead sprayer operation and water quality will determine the volume of water being applied to the plant, so they should all be monitored regularly.
If the plants are adequately watered over hot periods, there is every chance that your roses will continue to bloom and maintain their health. Finally, the effects of watering can be optimised by ensuring thick mulch is applied around the roses.
(Picture on the right: Soul Sister blooms) | 
