There are a few different plants that put out new growth towards the middle of summer, like the catmint in the first photo. When is the best time to trim back this older growth so that the new can grow faster and look better? I tend to put it off because the old growth is still flowering somewhat.
The sticky geraniums in the next two photos are a similar thing but I think trimming would be more aesthetic because it's just the old flower stems sticking out above the leaf canopy. Do I trim these off even if a couple are still flowering sporadically? If it was my plant I wouldn't care, but I want it to look as good as possible for clients properties.
At what point would you clean up a yellowing Columbine? Or a spent batch of bee balm that's going to the mildew? I want them to be able to put as much energy into the roots as can so that they come back strong, but would cutting it at this point be very detrimental?
Thanks so much for any help 🙏 I would also be very interested in any resources (books, websites, YouTubers) for this specific landscaping knowledge. I've been gardening for quite some years but I'm just now dipping my toes into landscaping plants and care.
by claymcg90