Good morning, new gardener here. Moved from the city to the country two years ago and have found a new passion!

So here is my question, my artichokes have stopped growing and I don't know why. I started them from seed first week of March in my basement with a grow light. As soon as it was warm enough I started bringing them outdoors during the day. End of May they were ten inches tall and I planted them outdoors. I used my rototiller to dig the holes and added a generous portion of compost and peat well mixed in. I keep them well watered and fertilize every two weeks. They have grown only a couple more inches since being planted. So not looking good! They aren't wilted or dieing they just aren't growing. What should I do?

Thanks,

LindaLu