I need to plant seeds (Mushroom grass, jungle grass, etc…) for the Truffle and for farming. I tried placing down 3×3 dirt, and clicking-holding on all the blocks. That didn't work. How do I plant seeds so I can get the Truffle??
Terraria – How to plant seeds in Terraria mobile
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Related Solutions
The game has a total of 21 NPCs that can move into your house. They are:
- The Guide
- The Merchant
- The Nurse
- The Painter
- The Dye Trader
- The Demolitionist
- The Dryad
- The Arms Dealer
- The Party Girl
- The Goblin Tinkerer
- The Witch Doctor
- The Clothier
- The Mechanic
- The Angler
- The Traveling Merchant
Additionally, in hardmode you gain:
- The Pirate
- The Truffle
- The Wizard
- The Steampunker
- The Cyborg
- The Tax Collector
Finally, there is one event NPC that do not live in housing:
- Santa Claus (shows up randomly between Dec 15-31st)
If you look at the wiki you can see a list of all the NPCs in the game. You can tell which NPC is only available in the PC version because these NPCs have a small icon of a computer directly after their description. It looks like this: 
According to the wiki there is no item called the Valentine Heart. But if it were it'd be added in the Valentine update.
Maybe you mean the Broken Heart Crystal?. It summons a cupid pet, which is pretty much the same as the Wisp in a Bottle, i.e., a moveable light source.
It's probably not a Heart Arrow (which stuns enemies) or the Valentine Ring (which gives you extra jump height and 50% health regen if it were given to you by another person). Those two items are the others added during the Valentine Update.
If it is called a Valentine Heart I'd love a screenshot to find out more =p
Best Answer
In order to plant mushroom grass, it must be planted in mud, not dirt. This is likely why you couldn't plant it. I believe that jungle grass can also only be planted in mud.