These tiny Christmas trees are super cute and really easy to make.

Just use a size G crochet hook and worsted weight yarn (I used cotton).

Begin with an adjustable loop and continue with each round in a spiral (not joining rounds). Use a stitch marker and counter to keep track of rounds.
Rnd 1: 6 sc inside loop; pull loop tight (6 sts)
Rnd 2: 1 sc in ea st around (6 sts)
Rnd 3: (1 sc in next st, 2 sc in next st) 3 times (9 sts)
Rnd 4: 1 sc in ea st around (9 sts)
Rnd 5: (1 sc in next two sts, 2 sc in next st) 3 times (12 sts)
Rnd 6: 1 sc in ea st around (12 sts)
Rnd 7: (1 sc in next three sts, 2 sc in next st) 3 times (15 sts)
Rnd 8: 1 sc in ea st around (15 sts)
Fasten off and weave in end.
(The larger trees just continue the pattern, increasing by three stitches every other round until you have the height you want.)

Now, sew on buttons and a star on top, or leave them plain. I added a hanging loop for an ornament and just added a yellow star on top.

Voila!