My Ideas:
Eggplant - Tier ~5
-can be harvested for one egg, then reverts back to first growth state.
-takes twice as long as wheat to grow, growth affected by the same things as wheat.
-round, bush, eggy
-looks like a bush, with an egg on top when fully matured
-same resistance to trampling and bugs as wheat
Money Tree - Tier ~11
-has 3 states: sapling, tree, fruit.
-advances between the states at medium speed
-can only be harvested when at fruit stage
-if harvested with shears drops 1-3 coins and reverts to tree stage
-if harvested with anything else drops 1-3 coins and 1-3 money seeds, and is destroyed.
-looks like a sapling with golden leaves in first two stages, and grows grey dots at the third stage
-money, rich, heavy, tree
-requires high light levels and irrigated farmland
-cannot be trampled. completely resistant to bugs when at sapling and tree stage. when at fruit stage it has a low resistance to bugs.
-if it catches bugs at fruit stage then it will give nothing next time it is harvested.
Cloudberry- Tier ~12
-must be planted above sea level (level 64 or above)
-requires a light level of 13 or above to grow
-medium growth speed
-when harvested drops 1-2 cloud berries, which act as seeds and crop. harvesting completely destroys plant.
-cloud berries can be thrown and make lightning strike where they land
-can be crafted with water cells to give electrolysed water cells
-looks like a generic bush, the berries are white.
-high, white, electric, light, soft
-deals 1 point of damage per sec to anything standing on it
-resistance to bugs depends on height. low resistance at layer 64, almost complete resistance at level 127.
Sky Crystal - Tier 16
-created by crossing cloudberry and UUM plant (assuming it gets added)
-small plant with thin blue-green leaves, small light blue buds when mature
-very slow growth speed, only grows when on top layer of the world and in light level 15 (only possible when exposed to direct sunlight)
-dies if in a light level less than 14
-when harvested drops 1-2 crystal shard, which acts as seed and crop. % chance to be destroyed when harvested, dependent on its resistance.
-9 crystal shards in the crafting table get a (industrial?) diamond
-shiny, thin, crystal, sky
-completely resistant to bugs. trampling instantly kills it.
Rapeseed - Tier 14
-slow growth speed, only grows when in light level 15.
-drops 5-10 rapeseed, its seed and crop. destroyed when harvested.
-rapeseed requires a lot of processing to be useful
-macerate it to get shredded rapeseed, compress this to get compressed rapeseed. extract this to get rapeseed oil.
-rapeseed oil can be canned with empty cells (probably multiple oil per cell) to get ready made biofuel cells, or put in a furnace to get dried rapeseed.
-dried rapeseed can be used in furnaces/generators as fuel. burning this is slightly less efficient than making it into fuel.
-looks like a tall green plant, with lots of yellow flowers when mature
-industrial, yellow, burn, oil
-trampling resets its growth timer
-very high resistance to bugs normally, but very low when any adjacent rapeseed plants are infected.
That's all my ideas for now, i hope you like them. I tried to make them original and realistic.