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Do your research beforehand to make sure your chosen flowers are safe for soap making. A good rule of thumb is that if they're safe to eat, they're likely safe to put on your skin as well. Dried flower petals can look pretty in handmade soaps. Try hibiscus, rose, lavender, chamomile, goldenrod, and calendula. Try using dried plants such as eucalyptus leaves or dried citrus peels to add fragrance and color to your soap. Steer clear from non-edible and toxic flowers like dahlias, oleanders, foxgloves, or lily of the valley. If you're not sure about the safety of a particular plant, research it online or refer to a botanical safety guidebook. Fresh herbs, flowers, fruits, and leaves can lead to mold and bacteria. Avoid using fresh plants to keep your soap safe, sanitary, and long-lasting. The only plants you should try fresh are lavender, rosemary, and thyme. The leaves of these herbs are pretty dry to begin with, and they can look attractive when used whole at the top of the soap. Avoid mixing them into the liquid glycerin, though.
Use only safe, edible flowers and plants in your soap. Refrain from adding fresh plant elements to your soap.