Watermelon Seed

What is Watermelon?

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

Property	Value
Rarity	Uncommon
Acquisition	13,000 Farm Coins
Base growing time	8h
Base HP per produce	1,440
Base HP/hour per plot	180
Weather affinity	Heat Wave (+20%)
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 Watermelon in the seed list (use its name or rarity filter), then choose Buy copy and confirm. One permanent copy costs 13,000 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 Watermelon seed levels
Level	Cost to reach (coins)	Cumulative coins	HP each	Growing time	HP/hour	Farm level required
1	0	0	1,440	8h	180	1
2	500	500	1,526	7h 50m 24s	194.6429	1
3	700	1,200	1,612	7h 40m 48s	209.8958	2
4	980	2,180	1,699	7h 31m 12s	225.9309	3
5	1,380	3,560	1,785	7h 21m 36s	242.5272	4
6	1,930	5,490	1,872	7h 12m	260	5
7	2,690	8,180	1,958	7h 2m 24s	278.125	6
8	3,770	11,950	2,044	6h 52m 48s	297.093	7
9	5,280	17,230	2,131	6h 43m 12s	317.1131	8
10	7,380	24,610	2,217	6h 33m 36s	337.9573	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 Watermelon
Mastery level	Additional progress	Total progress	Added HP each	Base-point bonus
0	0	0	0	0%
1	3	3	29	2%
2	5	8	58	4%
3	7	15	87	6%
4	10	25	116	8%
5	15	40	144	10%
6	23	63	173	12%
7	34	97	202	14%
8	51	148	231	16%
9	77	225	260	18%
10	115	340	288	20%
11	173	513	317	22%
12	259	772	346	24%
13	389	1,161	375	26%
14	584	1,745	404	28%
15	876	2,621	432	30%
16	1,314	3,935	461	32%
17	1,971	5,906	490	34%
18	2,956	8,862	519	36%
19	4,434	13,296	548	38%
20	6,651	19,947	576	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	3,351	6h 33m 36s	510.8232

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.