Harvest the leafy upper portions of jewelweed plants on a dry day, after the morning dew has burned off.
Chop the leaves and softer stems roughly with garden shears or kitchen scissors.
Pack the chopped jewelweed firmly into a clean pint mason jar, leaving about an inch of headspace.
Pour oil over the leaves until they're fully covered, still leaving a little room at the top.
Leave the lid loose or off so moisture from the fresh leaves can escape during the infusion.
Hold the jar at 110 to 120°F for 24 to 48 hours. A dehydrator set to 115°F, a yogurt maker, or an Instant Pot on yogurt mode holds the temperature without attention. On the stovetop, set the jar on a trivet in a pot with an inch of water and cycle the heat.
Strain the warm oil through a cheesecloth-lined mesh strainer into a clean heatproof bowl. Do not squeeze the cheesecloth. Let it drain on its own. Measure the strained jewelweed infused oil. From a single batch starting with 1 1/4 cup, you should have about 1 cup strained oil as some is always lost to tools and straining.
Set the bowl over an inch of simmering water, add the beeswax, and stir until melted and smooth.
Pour into tins or small glass jars immediately.
Leave uncovered for at least 30 minutes before putting lids on.
Notes
Yield ~ Makes about 12 oz of finished salve, enough to fill six 2-oz tins.Beeswax ratio ~ One ounce of beeswax for the full batch gives a soft, easily spreadable salve. For something firmer, work up toward 1 ounce per cup of oil. Test by dropping a spoonful on a plate from the freezer and letting it set 30 seconds. Too soft, rewarm and add beeswax a teaspoon at a time. Too hard, rewarm and add oil a tablespoon at a time. The beeswax scales with the oil, so a triple batch takes 3 oz.Substituting oils ~ Olive oil is what I use most. Grapeseed is light and non-comedogenic, sweet almond is mild, and jojoba absorbs fastest. Coconut oil firms up on its own at room temperature, so back off the beeswax slightly if you use it.Infusion methods ~ Hold the jar at 110 to 120°F for 24 to 48 hours. A dehydrator, yogurt maker, or Instant Pot on yogurt mode is the most hands-off. A slow cooker works only as an insulated water bath, never as a direct heat source, since even keep-warm runs around 170°F and will cook the leaves. Above 140°F you lose potency.Watery orange layer ~ If you see a rust-colored liquid under the infused oil, that's water squeezed out of the fresh plant material. Pour the clear oil off the top and leave the sludge behind. Water in a finished salve invites mold.Shelf life ~ About a year in a cool, dark, dry place. A few drops of vitamin E oil stirred in with the beeswax extends it. Discard if it smells rancid or shows mold.For sensitive skin ~ Patch test on a small area first, and stop using it if irritation worsens.Plant prep note ~ No need to separate flowers from leaves. Use the whole upper portion of the plant. It works out to roughly 98% leaves anyway. Don't wash the plant material unless it's genuinely dirty, and if you do, dry it completely first.Vegan version ~ Substitute candelilla wax for beeswax at roughly half the amount. See the vegan herbal salve recipe for ratios.What this salve isn't for ~ Skip it on deep cuts, punctures, serious burns, or infected skin.