Yellow Onion Seed

What is Yellow Onion?

Yellow Onion is a common, passive-cadence permanent seed in the root family. One owned copy supports one simultaneous planting. Harvesting returns that copy to availability; it does not consume the seed.

Property	Value
Rarity	Common
Acquisition	1,500 Farm Coins
Base growing time	6h
Base HP per produce	684
Base HP/hour per plot	114
Weather affinity	Clear Skies (+15%)
Generation	1
Seed level cap	10
Mastery cap	20
Season	Not 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 Yellow Onion in the seed list (use its name or rarity filter), then choose Buy copy and confirm. One permanent copy costs 1,500 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 Yellow Onion seed levels
Level	Cost to reach (coins)	Cumulative coins	HP each	Growing time	HP/hour	Farm level required
1	0	0	684	6h	114	1
2	100	100	725	5h 52m 48s	123.2993	1
3	140	240	766	5h 45m 36s	132.9861	2
4	200	440	807	5h 38m 24s	143.0851	3
5	280	720	848	5h 31m 12s	153.6232	4
6	390	1,110	889	5h 24m	164.6296	5
7	540	1,650	930	5h 16m 48s	176.1364	6
8	760	2,410	971	5h 9m 36s	188.1783	7
9	1,060	3,470	1,012	5h 2m 24s	200.7937	8
10	1,480	4,950	1,053	4h 55m 12s	214.0244	9

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 Yellow Onion
Mastery level	Additional progress	Total progress	Added HP each	Base-point bonus
0	0	0	0	0%
1	4	4	14	2%
2	6	10	28	4%
3	9	19	42	6%
4	14	33	55	8%
5	20	53	69	10%
6	30	83	83	12%
7	46	129	96	14%
8	68	197	110	16%
9	103	300	124	18%
10	154	454	137	20%
11	231	685	151	22%
12	346	1,031	165	24%
13	519	1,550	178	26%
14	778	2,328	192	28%
15	1,168	3,496	206	30%
16	1,752	5,248	219	32%
17	2,627	7,875	233	34%
18	3,941	11,816	247	36%
19	5,912	17,728	260	38%
20	8,867	26,595	274	40%

A clearly defined maximum-seed example

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Scenario	HP each	Time	HP/hour
Level 10, Mastery 20, matching weather; no buildings/companions, Level 1 plot	1,526	4h 55m 12s	310.1626

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.