Should I be scared of planting a Matilija poppy?
On one side of my back yard, I have a 6' high concrete block wall that runs 40'. On the other side of the concrete block wall is a small alley. The alley side receives full morning sun and then afternoon shade. There's about 12" of sand between the wall and the asphalt of the alley. I'm hoping that a few creeping fig vines will cover up the ugly block wall over time.
Along with the creeping fig vines, I'd like to plant something flowering that gets tall, but not bushy along the wall. I love the tall flowering stems of Matilija poppies. I understand that if they're happy, they can get invasive, spreading by rhizomes.
With that said, I've battled rhizome-spreading plants such as running bamboo (alien rhizomes!) and acanthus (snail buffet!) before and I'd like to get advice about whether I should think long and hard before planting this gorgeous California native or if I should just try it out and not worry about it.
Here's a pic of the block wall: