A visitor to As the garden grows told me that they’d seen some tiny red bugs on their bearded Iris leaves. Blasting the plant with water didn’t help because the bugs came back out again once the leaves dried off.
Spraying the plants with a blast of water was actually a good move and it can be helpful with many types of insect infestations. The insects that she saw were probably aphids. They love new growth on plants and you’ll often find them on tender young leaves or flower buds. They suck the plants juices and can get unsightly if they aren’t controlled.
Aphids breed quite quickly. If you have plants that are infested by aphids you should give them a blast of water daily. You might also add a drop or two of dishwashing liquid to a spray bottle and spray the areas of the plant that are heavily infested. The soap will smother the aphids.
Whatever you do you do not want to kill any ladybugs. Ladybugs love eating aphids and they are beneficial insects in your garden. So, if you use the soapy water method try to watch where you are spraying and avoid hitting any ladybugs.