I think this is originally an English traditional song, but was made famous
in the 70s by Foster and Allen, a duo from Ireland. The chords work in
simple strumming patterns or just play them with a simple picking method.

3|2|0|0|0|3 G
x|x|0|2|3|2 D
x|x|0|2|1|2 D7
x|2|4|4|3|2 Bm
3|2|0|0|0|1 G7
x|3|2|0|1|0 C

G (320003@1)    D (xx0232@1)               GCome (320003@1)all ye maidens young and fair
     G (320003@1)          Bm (x24432@1)            D7And (xx0212@1)you that are blooming in your prime
G (320003@1)       G7 (320001@1)     C (x32010@1)              D7Always (xx0212@1)beware and keep your garden fair
    G (320003@1)     D7 (xx0212@1)           GLet (320003@1)no man steal away your thyme
    G (320003@1)      D (xx0232@1)            GFor (320003@1)thyme it is a precious thing
    G (320003@1)          Bm (x24432@1)              D7And (xx0212@1)thyme brings all things to my mind
G (320003@1)                 G7 (320001@1)        C (x32010@1)               D7Thyme (xx0212@1)with all its flavours*, along with all its joys
G (320003@1)            D7 (xx0212@1)             GThyme, (320003@1)brings all things to my mind
G (320003@1)     D (xx0232@1)             GOnce (320003@1)I had a bunch of thyme
  G (320003@1)          Bm (x24432@1)       D7I (xx0212@1)thought it never would decay
     G (320003@1)           G7 (320001@1)        C (x32010@1)               D7Then (xx0212@1)came a lusty sailor, who chanced to pass my way
     G (320003@1)      D7 (xx0212@1)            GAnd (320003@1)stole my bunch of thyme away
     G (320003@1)    D (xx0232@1)          GThe (320003@1)sailor gave to me a rose
  G (320003@1)        Bm (x24432@1)         D7A (xx0212@1)rose that never would decay
   G (320003@1)        G7 (320001@1)   C (x32010@1)       D7He (xx0212@1)gave it to me to keep me reminded
    G (320003@1)     D7 (xx0212@1)            GOf (320003@1)when he stole my thyme away

*sometimes i have heard versions where they say "labours" instead of "flavours", so use 
either on preference :)

http://www.allcelticmusic.com/artists/Foster%20and%20Allen.html