Patience. If they are three years old they will not be much bigger than that. It’s about the 5th or 6th year in my experience when they begin to get to pencil size. You can harvest them and eat them after about three years but better to wait until year 5.
Thanks. I’ll stop attempting to dig them up. They are in a bed in front of a hedge of roses that I planted two years ago. They don’t look bad when they grow which is why I haven’t obsessed (plus they are in the back yard where no one else can see).
One thing I’ve been thinking if is to intermingle edible plants along with my normal decorative ones. This would fit in with that.
IE not a traditional garden but a garden that is visually appealing in my neighborhood where the HOA is pretty strict.
Maybe that can be a topic for another day.