I've been trying to remember the title of the show myself, although I do remember it airing mid- to late morning, say in the 9:30-10:30 range, during the week--I'm not sure whether it aired only once a week or was a "stripped" (Monday-to-Friday) show like Mr. Dressup.
I also remember certain other aspects of it. The set designs were very simple on a You're a Good Man, Charlie Brown kind of level--very sparse backgrounds, if they were used at all, and relatively simple set pieces (the orange dome-shaped spaceship, which had a couple of porthole-like windows, was likely modelled on a dome-shaped tent). The only notable departure from this simplicity was that mechanical effects would have been used for the flower set piece--its four petals were built to be strong enough for the woman to walk the length of one of them, as though it were a drawbridge. I think the spaceship's main door might have been built around a similar principle, though I don't remember whether the door opened down like a drawbridge or up like the doors of a Lamborghini.
I remember one episode in which the spacemen and the woman were in an average-sized room in one scene; this room may have been intended to represent at least part of the interior of the woman's flower-house. This room set, in contrast to the other sets, was dressed to the max, painted in a variety of colors (the show would have been produced during the transition from black and white to color).
For the end credits (and probably the opening credits as well), a chroma key/zoom effect was probably used, because I definitely remember shots showing the ship flying through space against a black "space" background--the ship would "pass" the camera and "fly off" into the background. It's about the only way you could produce such an effect on a budget that small.
I don't think the show would have aired on TVOntario. That channel didn't start broadcasting in Ottawa until October 1975, and I seem to recall the show airing earlier than that (probably around 1971-1973 to capitalize on the last Apollo moon missions and perhaps also the launch of Skylab). In the Ottawa market the show probably aired on either CBOFT (the French CBC) or the TVA network. I'm not sure whether TVA had an Ottawa station at the time; we probably got the feed from Montreal.
Is it possible the show might also have been distributed, at least in part, on 3/4" videotape for playback in schools around that time? I seem to recall seeing at least one or two episodes in color in my kindergarten class around 1971-72--I don't think it would have been cost-effective in those days to equip the classrooms with a cable TV feed, and it seems to me the signal we got was much clearer than rabbit ears would allow.