Answer:
The title of Doris Lessing’s “No Witchcraft for Sale” is ironic because there is witchcraft involved in Gideon’s responses to the scientists.
Explanation:
After the event in this excerpt, and the full recovery of Teddy, The Farquars told around how this "magic" plan of Gideon had made the miraculous cure, then one day a scientist after listening to the story paid The Farquards a visit to their house to know how was the plant used and what plat was it, after not giving direct answers and being evasive Gideon tells the scientist that witchcraft or native plant remedies are not for sale. It is Irony because everyone wanted to pay for something that they couldn't buy and people wanted to sell something that they didn't possess, the only person in known was no interested in being part of it.
