If I plant seeds from my 4 o'clocks, will they eventually turn into tubers and how long will that take?
Four o'clocks reseed themselves liberally, so if you want to gather seeds and plant them, that should work. The tubers develop over the course of a summer, to help the plants through the winter. Here are a couple of articles that could give you some food for thought: https://www.gardeningknowhow.com/ornamental/flowers/four-oclocks/four-oclock-plants.htm
I bought some variety that does not have a fragrance but was wondering, as I live in southern Ontario (in the GTA ) Mississauga, what is the coldest temperature that these beautiful plants can tolerate? Do I need to dig the roots up and bring them in for overwintering or can I leave them in the garden for next year? I do realize that it gets down to -29-30 in winter, but usually around -25. Again, thank you!
In your zone, they would not survive the winter, and as they are annuals, but you can dig the roots and store, then plant in the spring. You can also gather seeds from yours, and store them over the winter, then sow them in the spring when all chance of frost is past. This article should help you out. http://www.craftygardener.ca/four-oclocks/
What do four o'clocks look like when they first come up? How do I grow them? Thanks.
These articles have basic info on growing these plants: http://www.gardenersnet.com/flower/fouroclock.htm
Why do my large four o'clock plants keep falling forward to the ground? How do I help them stand up straight? The four o clocks have some heavy stalks and some thinner ones. They look all tangled up. They have bright pink flowers and large leaves. The stalks look as though they are too heavy to hold upright. I fed them, added garden soil and mulch. They are in a sunny spot and have returned many years. This year and last year they fell forward after standing up for several years.
To keep them from flopping over you can give them a good pruning by mid June.
Here is a link about their care requirements.
I waited too late to plant the seeds so I put them in big pots.
Allow the pots to go dormant naturally.
You will want to periodically add some moisture to the pots so the roots do not totally dry out.
You can add a layer of mulch to the top of the pot to help with moisture evaporation.
Recently this month we had a drain put in the front of the house to keep water from getting into the basement wall. My four o'clock plants were buried deeper with about 1.5' of soil before they grew. Each year I cut them down in the fall and they grew again in the summer and were always very full and tall. Do you think they will recover and grow this year?
I have had things happen in my gardens where the Four O'Clocks got buried deeper too. They have come back but did seem to take a little longer to poke their heads up. Just this year we had added some extra amended soils to the side of our house before doing some new plantings. The four o'clocks in there have come back nicely and they definitely got buried deep!
When is the best time to dig these up and transplant?
They can survive dividing at any time.