What is Crystal Cabbage?

Crystal Cabbage is a rare, overnight-cadence permanent seed in the vegetable family. One owned copy supports one simultaneous planting. Harvesting returns that copy to availability; it does not consume the seed.

PropertyValue
RarityRare
Acquisition73,000 Farm Coins
Base growing time8h
Base HP per produce2,376
Base HP/hour per plot297
Weather affinityCool Front (+20%)
Generation1
Seed level cap10
Mastery cap20
SeasonNot restricted to a named Harvest Pass

Planting and harvesting explains available seed copies, timers and freshness. Seed upgrades and Crop Mastery are separate systems.

Where to get it

Buy additional copies in the Farm Coin Shop. Find Crystal Cabbage in the seed list (use its name or rarity filter), then choose Buy copy and confirm. One permanent copy costs 73,000 Farm Coins. Buying a copy is different from paying to upgrade its level.

Once acquired, look for this seed on Seeds or in an empty plot’s planting menu. If all copies are planted, wait for a harvest or obtain another copy; produce in the Barn is not a seed copy. All item sources explains the different shops and reward routes.

Seed levels and exact upgrade prices

“Cost to reach” is the one-step purchase from the preceding level; Level 1 is the starting state. Cumulative cost excludes buying the seed. HP/hour assumes instant replanting, one produce per harvest, no mastery, no matching weather, and no building or companion effects. The farm-level requirement applies to purchasing that level.

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All ten Crystal Cabbage seed levels
LevelCost to reach (coins)Cumulative coinsHP eachGrowing timeHP/hourFarm level required
1002,3768h2971
22,0002,0002,5187h 50m 24s321.17351
32,8004,8002,6617h 40m 48s346.48442
43,9208,7202,8037h 31m 12s372.73943
55,49014,2102,9467h 21m 36s400.27174
67,69021,9003,0887h 12m428.88895
710,76032,6603,2317h 2m 24s458.94896
815,06047,7203,3736h 52m 48s490.26167
921,09068,8103,5166h 43m 12s523.21438
1029,52098,3303,6596h 33m 36s557.77449

Mastery requirements and points

These are raw harvest-equivalent requirements without Greenhouse, Supplier or companion progress. Mastery adds points from the seed’s original base HP, not from the upgraded level value. The percentage column describes that original base; integer rounding can make the exact points slightly higher.

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Mastery thresholds for Crystal Cabbage
Mastery levelAdditional progressTotal progressAdded HP eachBase-point bonus
00000%
133482%
258964%
37151436%
410251918%
5154023810%
6236328612%
7349733314%
85114838116%
97722542818%
1011534047620%
1117351352322%
1225977257124%
133891,16161826%
145841,74566628%
158762,62171330%
161,3143,93576132%
171,9715,90680834%
182,9568,86285636%
194,43413,29690338%
206,65119,94795140%

A clearly defined maximum-seed example

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ScenarioHP eachTimeHP/hour
Level 10, Mastery 20, matching weather; no buildings/companions, Level 1 plot5,5326h 33m 36s843.2927

This is not the maximum possible farm output. Plot yield, pond reductions, Windmill strength, active companions, late harvesting, fertilizer and downtime change actual results. Harvest Point calculations explains the rounding and order of operations.

Common questions

Why is inventory worth less than the seed card? An older crop retains its planting-time stats and can lose value if harvested after its Perfect Harvest window. Inventory shows its recorded HP per item. A new seed upgrade does not retroactively alter an already growing crop.

Does a higher-yield plot give extra seed copies? No. It gives extra produce. One crop harvest still advances base mastery once, regardless of how many produce items it yields.