Here is a link to my column in today's edition of The Spokesman-Review: Artichokes require new seedlings each year. In it, I discuss how to grow artichokes and also basil, both of which are warm-season crops.
Since they are both tender veggies, you should wait until late May to plant them outdoors. We can still have some frosts over the next 3 weeks, so be sure to keep an eye on the weather forecasts to get an idea of when you can plant veggies like these as well as tomatoes, peppers, eggplants, squash, melons and cucumbers.
By the way, I need to make a correction to today's column. I inadvertently stated that potassium is the middle number on fertilizer containers but should have said phosphorus. I know darned well, that the middle number is phosphorus but apparently my brain and fingers weren't communicating with each other when I wrote the column! I'm always very careful about what I write and hate making mistakes like that. My apologies for the error.