Looking for the name of a shrub flowers start off blue then turn pink then turn white and are very fragrant flowers in the summer . I saw it originally on a site 10 must have for your garden but cannot find it again.
Thank you for contacting Toronto Master Gardeners with your enquiry about a flowering shrub.
One shrub which fits your description is Yesterday, Today and Tomorrow shrub, Brunfelsia ssp. a member of the Solanaceae or nightshade family whose flowers exhibit three stages of colour as they age and are delightfully fragrant. There are a very large number of species in the Brunfelsia family with a variety of flower colours.
A useful article https://www.gardeningknowhow.com/ornamental/shrubs/yesterday-today-tomorrow/yesterday-today-tomorrow-plant.htm provides cultural information, and although the shrub planted in the ground is listed for much warmer plant hardiness zones than we experience, the shrub can grow well in a container which can be taken indoors for our frigid winter climate.
One caution about the plant is that it is toxic to dogs if flowers, leaves, berries, or seeds are chewed by them. http://veterinarymedicine.dvm360.com/toxicology-brief-brunfelsia-species-beautiful-deadly
This shrub is available in the Greater Toronto Area.