Container garden plants need regular attention to maintain them in prime condition to ensure the best display possible. Your window box gardens will always look there best if you make it a habit to inspect them. I like to inspect my plants when I am watering them.
Window boxes and other container gardens dry out very quickly and regular watering is essential. I live in Utah where the air is very dry. So I water early morning or late evening during summer months. If only one watering is possible, I always water in the morning to ward of the heat of the day and to avoid any diseases and slugs.
A watering can is adequate for small window boxes although a hose will be more effective for larger ones. Keep to the bottom of the plants as much as possible. Your herb plants will thank you.
Using a good food pellet when you first plant your window box should last about 3 months. The slow release granules of a product like “Osmocote” makes feeding a breeze. For the rest of the season I like to give a good dose of “Miracle Grow” every week. Always follow the manufactures directions. More is not better when it comes to fertilizers. You do not want to burn your plants.
Deadheading And Pruning
Promote more blooms and plant growth by removing dead faded flowers and leaves. This will also keep your plants healthy and free from disease. I am not a big deadhead fan, not that I do not like to spend time caring for my plants, it is a time factor. I like to plant flowers and herbs plants that do not need to be deadheaded. Petunias fall into this category. The flowers are bright and showy, yet they do not need extra care.
Finding seedlings in my garden and transplanting them to a window box not only brings a continuity to my garden, it saves on buying plants. Herb plants can be expensive. I also exchange with my sisters and neighbors.
Carefully lift the plants and move them into your window box. I like to use fresh soil around my transplants. Prune the plant back, leaving enough foliage for light to feed the plant, but give an extra jump-start to the roots. I always transplant in the evening if the weather is hot. This gives the plant a chance to get started in the cool night hours.
Perennial herbs in your window boxes will need extra attention in the spring and fall. In the spring check them for diseases and prune them to fit in your planter. In the fall you may want to take them into a garage or green house, to keep the roots from freezing over the winter.
Have fun designing your window boxes.