Sunflowers typically grow in Manitoba during the summer months, which is generally from late May to early September. Manitoba has a relatively short growing season due to its northern location and colder climate, so sunflowers are typically planted in late spring or early summer once the risk of frost has passed. They then grow and mature throughout the summer, with their peak flowering period typically occurring in July and August.

It’s important to note that specific planting and harvesting times can vary depending on the exact location within Manitoba and the weather conditions in a given year. Farmers and gardeners in Manitoba may adjust their planting schedules based on local climate and soil conditions. If you plan to grow sunflowers in Manitoba, it’s a good idea to consult with local agricultural extension services or gardening resources for more precise planting and growing information based on your specific location.