In a blender, mix ½ cup castor oil and 2 Tbsp. liquid detergent until thick, like shaving cream. Add 6 Tbsp. water and blend again. Add 2 Tbsp. of the oil mixture to 2 gal. of water in a watering can. Stir and sprinkle the liquid on the soil over newly planted bulbs. Reapply after a rain.