Hi there master gsrdeners,
I have some of this in my garden. Could you tell me what it is? Shall I keep it?
Thank you for contacting the Toronto Master Gardeners with your plant identification question.
Well as it turns out , many people have this plant in their garden, some intentionally and some not.
Forget-Me-Nots are widely sought after for their dainty blue flowers or white flowers. Easily grown in organically rich, consistently moist, well-drained soils in full sun to part shade. Plants appreciate part afternoon shade.
Although technically a short-lived perennial, this plant is often grown as a biennial by planting seed in the ground in mid-summer for bloom the following year. It is also often grown as an annual by starting seed indoors about 8-10 weeks before last spring frost date for bloom the same year. Regardless of method, plants will persist in the garden for many years by freely and sometimes aggressively self-seeding. In formal garden areas (e.g., border fronts) where naturalization is not desired, some gardeners pinch some finished flowers immediately after bloom to minimize self-seeding.
So hopefully this gives you enough information to determine if you wish to keep it or remove it. If you wish to try it out and see if you want to maintain it, it is easy to pull out and remove before it goes to seed.