If you are interested in the seeds, they must be nice Q?, you need to harvest them with a char with higher farming than the seeds for them to keep their Q, so you will risk a nice farmer making it leave vandal scents?, I dont think it is a good deal.
If the seeds are low Q, not at all worth loosing a char, unless you work out a vandal char and dont care to loose it by being summoned. Better to get wild windsom weeds and dry them in a nice herbalist table that lifts their Q, instead than in a rack that keeps the Q from the original www.
So for doing this getting the nice Q seeds, it is nice Brams idea. For bashing the pclaim u need a char with at least 100 str and make it use an axe, so u only leave one tresspasing scent when u get into the claim. If you use a ram to bash the claim I think you will leave vandal scents, but this im not sure.
Or if you have a Vidol you can trade for seeds, most traders accept bears for payment, and not all seeds are worth so much as to pay for them, so you can make a mix from seeds gotten from www and buy flax or hemp for fibers (hemp also is nice for buds, but flax can be higher Q), grapes for wine, cheese and jewellery and maybe carrots, that is if you want high Q wax.
Good luck and welcome to the game!.

Edit: I forgot, seeds Q drops if they are not harvested, so if the claim has been abandoned for long time they must be totally outdated.
Another one, u say an abandoned claim, but you do not say if it is pclaim or Vclaim?. I think idols can be bashed easily when they have low authority, and if they have low auth we dont leave scents when harvesting/destroying/etc. I think it is when auth drops below 50k.
In the wiki u can find usefull info:
http://ringofbrodgar.com/wiki/Haven_and_Hearth_Wiki