April 1’s edition attracted 2.18m viewers.
Figures for 25 March were 2.27m, up 220,000 on the previous edition.
The first programme of the new series presented by Monty Don-presented attracted 2.5m viewers.
The 18 March edition was down to 2.05m after meeting competition from Comic Relief programming.
Gardeners' World in 2010 averaged 1.8m a programme.
Monty Don will present an hour long Gardeners' World programme on Good Friday, 22 April.