This is a new mesh, and means that it's a brand new self contained object that usually does not require a specific Expansion pack (although this is possible depending on the type). It may have Recolours hosted on MTS - check below the description for more information.
St Patty's is near.. It's about time I shared this! :P
Shamrock Plant - cloned from a sculpture, doesn't require water - costs 9 S,
mesh file contains recolors. Half-tile mesh is slaved to it, costs 4 S.
and/or
Six recolors of Papaver's Poppies from base game.
All available in Build mode/Garden center/Flowers
The new mesh doesn't cast a shadow (unlike the Poppies).
If you play with object shadows off, these two versions of shamrock look almost identical.
I tend to mix both - so my Sims only need to water a few patches, not the whole darn lot.
If you like my model, look for the file in the comments section.
I've generated random GUIDs for these items.
GUID used:
0xE6CB2E53, 0xD9C7259F
There's a very slight chance somebody generated the same GUID (mesh object's unique ID) for The Sims 2 creation at some point.
If you put two custom objects with the same GUID in the game files, only one of them works.
As always, remember to check if new objects you put in your folders show up in the game.
Credits:
EA Maxis, for the flower mesh
CC in the screenshots:
Artemida's default Top Hat mesh
Amaryll [AL] Landlord Vest
Ground Fern TS4 to TS2 conv. by Limonaire
base game shorts - all recolored by me