You haven't learned this reading for 植 yet, so here's a mnemonic to help you:
You decided to plant an uni (う) tree in your backyard. That's right, you can plant uni and they'll grow like fruit off a really spiky tree. Just picture it. And then you'll get to eat all the uni you want!
There are some cacti planted on the rooftop of the Tofugu office.
I think you've planted more than enough tulips.
Where do you plan on planting that seed?