When it comes to candles and keeping them burning their best, there are some tips and tricks you can use:
Wicks – Keep your wicks to a ¼” long when you light them. Any longer and the candle will burn too hot which means it will not last as long as well as burn hotter which can cause blackening on the jar.
Vents/Drafts/Fans – Keep your candle away from these items, especially if it is not in a jar or other holder and the air hits the wick directly. This can cause uneven burning, hotter burning, or other issues.
Burn Level – Do not burn your candle right down to the bottom as you can end up destroying the jar or holder.
Sun – Keep your candles out of the sun, as it can cause them to fade as well as it can soften the wax or cause your candle to misshapen.
Safety – Of course, it goes without saying that you do not burn your candle anywhere near flammable materials. This means near curtains, bedding or anything else that can easily catch fire.
Never leave a burning candle unattended or where a child or pet can get to it and knock it over. Make sure to extinguish a candle before going to bed or leaving your home.