The phenomenon
A semi-desert that erupts in wildflowers for a few weeks a year — daisies, succulents, and oddities you won't see anywhere else. It's one of the world's great floral spectacles, and it happens on a clock: the bloom depends on winter rainfall and runs roughly mid-August to mid-September, peaking late August in a good year. In a drought year, there's almost nothing; check the season's reports before you drive eight hours.
Where
The Namaqualand stretch of the N7 north of Cape Town — Goegap and Namaqua National Park are the headline reserves, with driving routes through the flower belts. The West Coast National Park (Langebaan) is the easier day trip from Cape Town — the Postberg section opens only in flower season and is the closest reliable bloom.
How to do it
Drive, slowly, over a few days. The flowers open with the sun and close by mid-afternoon — mornings are the time, and a cloudy day is a wasted day. Cover ground between reserves, stop where the field is thick, and don't expect the whole desert to be carpeted; the bloom is patchy and that's part of it.
Be honest about it
It's a long way for a maybe. A great flower year is unforgettable; a poor one is a long, hot drive with some daisies. Go if you're already in the Cape in late August, love botany, or want a road trip few tourists do. Don't fly across the world for it as your only reason.