Not that I know of, mine never has. You have to let it keep reseeding itself from my experience so far, I have been growing it for about 4 years. It seems to get so big, flowers, then dies off. The thyme question is one I have been thinking about lately too actally because I would ideally like a big pot full and so far have not been real successful at acheiving that. I grew it once in the open garden, right in the ground and it thrived, but ony for the season (maybe I should just do that and dry it). I started a new potful this year, some catnip too!! We'll see how it goes. I am going to be more meticulous about cutting the thyme back this time and maybe it will do better. Even my rosemary bushes, I have to keep making new cuttings and bring the smaller plants in for the winter, the one I left out this winter doesn't look too hot but it is flowering so maybe I can get some seed. I know if it gets real cold the rosemary will die outside. Oregano can stand some cold, but I keep that mainly in the house all winter too. This year I put all the potted herbs out in mid-March to get just a tad of cold, they seemed to like that, but most of those types of herbs about the same there as far as cold goes, not too much. Gotta pamper them. Thyme seems a lot like basil, grows so big, flowers then dies. Keep it cut back is my only input on that at this point, and grow it in a pot to bring in in winter. Wish I could help more with that one, it is the one mystery question about herbs here too. Hope my hyssop does better in a pot than it did in the ground, winter killed that outright. My little blueberries are covered with flowers. Feverfew can withstand some pretty cold temperatures without flinching, and parsley will over winter one season, but only those two that I have here. The echinacea dies back but grows back reliably year after year from the roots. I still have my original echinacea plant I started about 8-9 years ago, it has always lived outside and even survived a long move because I dug that up and brought it with us when we moved here 6 summers ago. It has made many many baby plants since then.
I made a light pesticide with some castille soap. I could only find the castille soap in a bar so I shaved some off and let it sit in a spray bottle, shook it to dissovle etc, anyway, it got rid of all the aphids on the iris and lilies. I was sitting on the porch the other day about 2 feet from the irises and i saw zillions of aphids on them... all gone now, mostly. It only took a few shavings in a quart bottle to do the job. Those aphids I've noticed, if you don't get them early in the season they are way out of control by June and then they spread to the tomatoes.
There is so much cilantro growing in the garden where I planted last year, i am leaving that area fallow this year and planting a different part, I went through and watered all the cilantro and dill volunteers and I will just eat that till my new seeded stuff is ready. I am doing a major amount of basil this year, going to freeze some and bottle some for winter. I really really miss the basil in winter.
A lot of work that garden. Have you read in the paper about the food shortages that are happening around the world?
Reseed your thyme. Try to save some seed for next year after it flowers.
Broccoli (and cabbage, onions, leeks, some lettuce) likes frost, plant it while still cold outside. I just put mine in the ground a few days ago but it has been outside since early March when i seeded it. It got snowed on several times. It likes that. Hardens it or something. Even the tomatoes I like to get them out there early, cool nights make for a bigger tastier harvest later, the young roots grow better when it's cool. Hopefully it won't frost again because i have way too many tomatoes to cover. I lost about 25 (tomato and pepper) plants to frost last year.