Mulching a flower garden or bed should be done after the plants have been established. If you mulch a new flower garden that has been planted by seed you will probably cover up some of the seeds with mulch and they will not be able to grow through the mulch.
Many gardeners spread a garden cloth on the flower bed or garden before they plant any plants in the flower bed. This garden cloth is designed to cover the soil so that weeds can not grow. Then they punch or cut holes into the garden cloth and plant flower plants into the holes of the cloth.
If you use a garden cloth you have flowers that are planted in a bed with a covering that will not allow the weeds to grow. The cloth is not very pretty so you can spread mulch over the cloth to cover it. You can use cedar mulch or cocoa mulch. The problem with the cocoa mulch is your garden will smell like chocolate. For some people this is not a problem but for me it is since I am a chocoholic that would need to eat some chocolate every time I went into my garden. The problem with cedar mulch is that it repels some moths and butterflies that like to survive around flowers. The moths and butterflies are pretty and add a lot to a flower garden.
When you spread the mulch place it gently around the flowers and try not to let the mulch touch the plants. Let the plants have a little room to grow so keep the mulch from touching any plants. Spread the mulch everywhere you do not want weeds to grow. The mulch is designed to keep weeds from growing. Unfortunately it will also keep your flowers from growing if it is allowed to suffocate the flower plants.
If you have a wild flower garden you can use leaves that fall off of the trees in the fall. Save the leaves from the fall and place them around your wildflower plants in spring when you can see where the plants are growing. Leaves are nature’s wild flower mulch since they add the kind of nutrition your flowers need.
You can get mulch for flower beds or gardens at a garden center near you. You may want to put lava rocks or decorative rocks in your flower bed instead of mulch or along with the mulch for decoration.