Ensure your juniper berries have been rinsed and properly dried
Add the juniper berries and needles to the mason jar.
Pour in your honey and cover the berries entirely. You may need to add more honey to coat the herbs entirely.
Cover the jar with a canning lid and ring. Place the jar in a crockpot and fill the crockpot with water - not so high that the jar floats or tips and gets water into it.
Set to low and keep in the crockpot for 8-12 hours. You want to ensure that the crockpot is warm, not hot (so aim for low heat, not high). The goal is to warm the honey to infuse with the berries and needles, but never so hot that it bubbles. Adjust, as needed, to ensure that the honey stays between 100-125 degrees F.
Strain the honey through a fine mesh strainer while it's still warm.
Store the herb infused honey in a dark, cool place in a tightly sealed jar to help it stay fresh.