Using mulch instead of soil for your flowers is totally doable! It just depends on the types of flowers you plant and your care.
Most gardeners prefer to plant in soil and spread a few inches of mulch on top of the soil – around the plant but not covering it. As a general rule, most experienced gardeners aren’t crazy about the idea of planting in mulch, or about using mulch in place of soil. If you want to experiment with mulch gardening, it may be worth a try, but start small in case the experiment doesn’t work.
You may be able to plant annuals, such as petunias, begonias, or marigolds, directly in the mulch. Annuals only live a single growing season, so you don’t have to worry about maintaining the plant for its long lifespan. However, the plants will require water frequently, as moisture drains through mulch very quickly. Without the stability provided by the soil, the plants may not survive a long blooming season. Additionally, plants are unable to draw important nutrients from the soil.
Perennials will probably have a more difficult time surviving in mulch only gardens.
You’re likely to have a difficult time planting seeds in mulch, but again, it’s worth a try, and you may discover that the technique actually works! Chances of success are better if the mulch is broken down like fine compost.
Coarse mulch doesn’t provide much support for seedlings – if they germinate at all.
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