im all for organic and this is my organic pest repellent of which i use for lemon and orange trees so it should work for cannabis plants. 4 cloves garlic(cut into small pieces), 3 large onions(cut into small pieces), 5tsp ground black pepper, 5 tsp ground chayenne chilli, 10 tbsp vegetable oil(instead of vegetable oil you can add organic detergent) put all in a bucket full of water and let it to sit for a week. if you have sunny weather put it out. when ready put in 1.5litre sprayer. put 1 litre of this mixture and 0.5 water spray 1 to 2 times every week( every 2 weeks spray clean water to wash off previously sprayed insecticide) Regarding slugs i use beer and it works fine everytime. cut a piece of bottle like 7 cm tall and 7cm wide, fill with beer and bury in ground so they are about 0.5cm above ground level when it fills with slugs throw away and put new ones