Hi Sage,
I can't find any mention of Watson's Land in the area you specify, there was a Watson's Land in Cambusnethan and one in Waterloo, neither of which is in the Low Main St area. There was also a Watsonsmid and a Watsonfoot but don't know which part of the town they were in. Are you sure you have the right area? According to the burial records she died in Cambusnethan, not Wishaw.
A "Land" was a "land o' houses" a tenement building or a row of 1 or 2 roomed cottages.
As for Kirk Knowe House, I don't think it has survived but leave that with me. It was in Cambusnethan Street, round about the numbers 209 - 219. It was still there in 1925 when it was occupied by Mrs A. Watson. (Is there a connection to Newmachar in Aberdeenshire with these Watsons?).
Cemetery records for the Private walled burial ground, between the old churchyard and the municipal cemetery at Cam'nethan.
Plot 446 & 447.
JANET WATSON. Housewife, Cambusnethan, aged 57 years, married.
Parents - George Jack and Jane Hill.
Interred in 447 on 12th November 1872.
AGNES WATSON. Cambusnethan, aged 2 weeks.
Parents - William Watson and Agnes Craig.
Interred in 446 on 5th February 1887.
WILLIAM WATSON. Spirit merchant, Cambusnethan, aged 79 years, married.
Parents - William Watson and Janet Lindsay.
Interred in 446 on 25th October 1910.
Lodger