Traditionally, joss or incense sticks, candles, and flowers are three of the common offerings. Informed Buddhists will know that these items are not really ‘offerings’, but are actually just symbolic reminders.
For example. joss sticks or incense remind us of the ‘fragrance’ of the Buddha’s Teachings which pervade the world. Candles represent His Teachings which light our way in darkness. And flowers remind us that our lives are impermanent, like the flowers we ‘offer’.
Flowers when in bloom are beautiful and sweet smelling, but will fade and whither after only a few days. Similarly, all of us will eventually grow old and die. Therefore, the flowers remind us that we should use as much of our time as possible to do good for others, and to practice the Buddha’s Teachings. Source: Just be good