I am growing basil in a pot outdoors and it's getting pretty big. How do I know when it should be transplanted to a larger pot?
There are really no hard and fast rules for repotting. For most plants, if you can remove the pot from around the roots, and the roots are all matted inside and retaining the shape of the pot, that is called root bound, and repotting is probably a good idea, for most plants. Other clues can be there's so much plant that the whole thing keeps falling over, or it doesn't seem to stay hydrated no matter how much water you pour in. Other than these things, most gardeners recommend that plants be repotted annually, to renovate the roots and replenish the soil. Here's an article that talks more about repotting: https://www.gardeningknowhow.com/houseplants/hpgen/learn-more-about-repotting-houseplants.htm
I'm preparing to cut my basil plant for drying and need to know if it should be washed before drying it.
Yes, you should wash herbs before drying. This article should help your project: https://www.gardeningknowhow.com/edible/herbs/hgen/how-to-dry-herbs-various-methods.htm
There are no raised bumps underneath! Leaves were fIne until the end of summer!
Unless you know for sure what the infectious agent is, I wouldn't eat the leaves. And of course, certainly don't eat if you've sprayed with a chemicals. This article on basil diseases may be useful to you: https://www.gardeningknowhow.com/edible/herbs/basil/basil-diseases.htm
Is it true that you should cut back your basil plant (grown inside) so that it will not get bitter?
You should do that with any basil plant. Cutting it back regularly will keep it from bolting (flowering). Once it bolts, it starts to become bitter.
Something is eating my basil and I'm not sure what it is. I put copper around my basil to prevent slugs but but still it's getting eaten. Can you please help me?
There is still a possibility that the slugs are still getting to it. You may want to set out a small pan of beer inside the copper barrier to test whether it is slugs or not.
It could be rodents as well. What does the damage look like?
We have a house on Bonaire, Netherlands Antilles and are bothered by iguanas. They leave their "poo" next to the pool, and all around the house. I do not leave any food, but they eat newly planted flowers, even Basilicum. I love your help. I heard of electrical fences, but would not know where to get them.
You could try electric fencing; however, plastic fencing will work just as well. Really, anything that creates a barrier will work. Iguanas are diggers and with digging animals, the solution is to dig a trench around the garden and bury the barrier you will be using down at least 6". This will stop them if they try to dig below. For additional info on iguana control, this article will help: https://www.gardeningknowhow.com/plant-problems/pests/animals/iguana-control.htm
I bought a basil plant on Friday at Trader Joe's and it was bright green and healthy, pretty mature. Today is Sunday and I came home to some dark spots on the leaves. I had not watered it since I bought it and it's been in my kitchen, so not receiving much light at least for the past 24 hours, as I was away. Is my basil wilting or does it have bacteria leaf spot? If it is bacteria, is this harmful to humans? And is there anyway to save my plant or should I return it?
Thanks!
Herb plants purchased at grocery stores are not really meant to live very long, just to be eaten within a few days. At least that's my experience. Don't eat the leaves with spots on them, but the rest should be okay. If you want to raise some herbs in your kitchen, you'll need to put them on windowsill, or provide electric light, and get potted plants from a garden store. Here's some more information: https://www.gardeningknowhow.com/edible/herbs/hgen/growing-herbs-indoors.htm
https://www.gardeningknowhow.com/edible/herbs/basil/information-on-how-to-grow-basil-indoors.htm