RSA 477:35-a: Conditional Deed.

I. After August 29, 1969, any conveyance of standing trees which includes therein a stipulation requiring that the trees be removed within a certain time or by a certain date shall render the deed conditional, and failure by the purchaser to remove said trees within the stipulated time shall result in the forfeiture of the purchaser's rights in the trees unless the deed specifically provides otherwise.

II. After the effective date of this paragraph, any conveyance of standing trees which does not include therein a stipulation requiring that such trees be removed within a certain time or by a certain date shall render the deed conditional, and failure by the purchaser to so remove said trees within 7 years from the date of conveyance shall result in the forfeiture of the purchaser's rights in the trees unless the deed specifically provides otherwise.