Glitter and flowers and herbs...oh my! I've talked about the topic of why dried flowers and glitter do not belong in candles countless times on my TikTok account, but nobody listens to Ol' Jenn. Never mind that I have presented evidence of candle fires featuring these items time and time again, and again, and again, and again.
Although these elements are aesthetically pleasing, they are unsafe to add to a candle because they are fire hazards. If the fire or glitter get too hot, they ignite and cause the fire to grow bigger. The bigger flame creates more heat, which can cause more heat than the glass jar can handle. If the glass is weakened too much, it can crack or explode. At that point, you're dealing with a real emergency because that fire can quickly spread to surrounding property, endangering people and pets. You have to act quickly to smother the flame and/or call the fire department for help. Never use water to put out a candle fire...that will anger it, and you won't like it when it's angry.
I don't even know how many times I've heard the following from other candle makers who use dried botanicals and glitter: "But I test my candles. I've never had an issue. No flowers have ever caught on fire." Congratulations...? That's great for you, love that, but that's clearly survivorship bias. In other words, just because you haven't personally had a problem doesn't mean that the problem doesn't exist. If you want to play with literal fire, then I hope your candle makers insurance covers your fire bombs.
Avoid tragedy; do not burn candles with dried botanicals or glitter.