The P-touch can use different colored and different sized labels, but I typically use the one-half inch size (.47" to be exact). I always order the white, laminated, indoor/outdoor labels. (The indoor/outdoor part is important if you plant to use these for your garden.) You can get some competitive pricing on eBay. P-touch has different type sizes so in case you have a plant with a really long name, you can still fit it on the label. My labeling system is older, but I'm sure there are many more features available on the newer models.
I also switched to Kincaid plant markers, which I had seen and liked in a garden that I visited. The Kincaid name plates are stainless steel and the posts are made of heavy-duty #10 gauge steel. The posts come in all sizes and shapes depending on your individual needs and likes. I purchased the eight-inch posts, which is just a personal preference. I like that that the markers aren't super obvious in my flower bed, but if I need to know a plant's name, I can easily find it. Every fall I put a tomato cage around each one of my daylilies to protect them over the winter from deer trampling. The cages provide a dual purpose in that the plant markers are protected as well. If any markers are out in the open, without protection, I usually push them down into the dirt for the winter.
So far, this labeling system has withstood the extreme fluctuation of temperature in Wisconsin and the weather has not had any effect on either the labels or markers. Both my labels and plant markers still look brand new, and not one has been crushed. In addition to me, three of my friends have also switched over to this plant marker and labeling system and we are all very happy.
Note: The labels are also great for household and garage use. They are an organizer's dream!
Brother P-touch label machines: https://www.brother-usa.com/home/label-printers/series/p-touch
Kincaid Plant Markers: https://www.kincaidplantmarkers.com/