Rose, thorn, bud is a simple tool for reflection for yourself or your team. The basic idea is to look back at a recent project or how things are going and consider each aspect of a rose:
If running as a team retro activity or retrospective, you might spend a few minutes individually adding thoughts for each prompt, then talk through each of the thoughts in Rose, Thorn and Bud.
A separate but no less important step is often to capture actions from the reflection—what you'll do as a result. If you're conducting retros regularly, consider revisiting actions from previous sessions.
I like "rose, thorn, bud" as it's beautiful to consider that a rose contains such different facets, like so many things.
I've come across many retro and reflection activities that are variations of these three prompts: "What went well?", "What didn't go well?" and "What else?" A few to mention:
A reader suggested a fourth aspect of the rose analogy to reflect on as its leaves or roots: what are the unnoticed or behind-the-scenes things that contribute to the rose's success?
I've come to consider that it doesn't matter too much what activity you choose to get a discussion going. What matters most is regular reflection, hearing all the voices in a team, and making progress together. One teammate ran an excellent retro by us all finishing early and heading to the pub.
I didn't intend it, but some of the products and prints for rose, thorn, bud out to be some of the nicest I have.
Also see: Information radiator, MoSCoW prioritisation, RACI, How to peel a Post-it so it doesn't fall down, the upward spiral