How to Get Rid of Ticks around your Yard - The Gardening Cook--Chrysanthemum cinerariaefolium has a high level of natural pyrethrins; other natural tick repellants are geranium, lavender, & peppermint EO's (not safe around cats).
Some of the hard to find stuff was grown from seeds from here. I caught one of the kids in the garden just snapping off swiss chard leaves and eating them. But I didn't let him know I saw him. Seed Savers Exchange - Free catalog of heirloom seeds
EPSOM SALTS -- considered the secret to a lovely, lush garden. For potted plants, dissolve 2 tbsp. Epsom salts per gallon of water, and substitute this solution for normal watering at least once a month, or sprinkle it into the soil before planting seeds.