I planted a Penstemon earlier this spring. The last time I checked on it I thought it looked a little strange. It turns out there’s a New England Aster growing in the same space. I’d like to be able to salvage both plants since that’s the best looking aster in my garden, currently. Everything else has been devastated by lace bugs, but this one only has minor damage. Do I need to dig up both?
In case the photo is confusing, the bottom portion is definitely Penstemon leaves. It’s difficult to see in this photo but they’re also on the other side. It even bloomed earlier this year. The tall portions sticking up look exactly like a young New England Aster to me. The portions that look like Penstemon, the lace bugs don’t touch. The aster portions have some minor lace bug damage. I only noticed due to the lace bugs. They don’t touch any of the other Penstemons in the garden so I was confused when I saw one hanging on this plant.
I agree with @Adverse_Reaction@anarchist.nexus, but you could substitute a shovel for a garden fork for loosening the soil around the roots. Sometimes a sturdy four tine fork makes things a little easier digging out plants of this size when you're trying to tease them apart but maintain your soil aggregates (within reason).
If you're in new england this weekend is a good time to split them - we're due for some major rain events next week and that will give them a break from heat stress while also helping to water them in, which will both help mitigate the transplant shock.