Basic Splicing Kit
From Growtopia
The Basic Splicing Kit gives you 10 Rock Seeds along with 10 of any seed with a rarity of 2 (like Grass). This pack is worth 200 gems.
Store Description
The basic seeds every farmer needs - 10 Rock Seeds and 10 more random seeds of Rarity 2.
Additional Info
Note that this still allows you to get seeds that are harder to get (like Martian Tree and Mission Block), so it makes a bit more sense to buy it. Also note that 10 Rock Seeds can be very useful in the long run, mainly because it's hard to get many of those seeds during world clearing or farming, along with the fact it has many splicing uses.
