Grow a Garden Harvest Moon Event Part 4 Preview: Cornling (Legendary, 25,000 Hunger, Corn Synergy), Maize Stalk & Eclipse Berry Divine Crops Wiki-Confirmed for August 22, 2026
Grow a Garden's Harvest Moon Event closes out with Part 4 on August 22, 2026, and the wiki has already committed to three new items: Cornling (Legendary pet, 25,000 hunger, Corn Synergy passive that transfers mutations between fruits and scales its preservation chance for every Corn plant in your garden), Maize Stalk (Divine crop, TBA-everything-else), and Eclipse Berry (Divine crop, TBA-everything-else). The Corn Synergy passive is the strongest wiki-confirmed detail of the update — it is the first pet ability in Grow a Garden that literally moves mutations between plants, effectively turning a Cornling-plus-Corn build into an active Moonbeam laundering machine and pairing thematically with the Maize Stalk name (Maize = Corn botanically). Because Maize Stalk and Eclipse Berry are still marked TBA and Unreleased, this preview is deliberately conservative: we cover every confirmed number, explain why the mechanic is significant, flag every gap, verify the three active Grow a Garden codes (torigate, BEANORLEAVE10, RDCAward) against the wiki this morning, and lay out exactly what to bank tonight if you want Cornling on your farm the moment the update goes live. Speaking as someone with thousands of hours in the original Grow a Garden, this is the finale part of the biggest August event and the last new drop before Harvest Moon ends on August 29 — the seven-day chase window is real.
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The Harvest Moon Event closes on August 29, 2026 — and Part 4 drops on August 22, giving you a seven-day chase window on the last new content this event will ever get. The wiki filled in the Part 4 item list over the weekend: two Divine crops (Maize Stalk, Eclipse Berry) and one Legendary pet (Cornling). Two of the three pages are still mostly TBA, but the one that is filled in is the interesting one, and it changes how you should think about the last week of Harvest Moon.
As someone with thousands of hours in the original Grow a Garden, the finale part of an event is almost always the ceiling craft. This time the ceiling is a Legendary pet with a passive that has never existed in this game before, on a hard seven-day window before Harvest Moon closes for good.
TL;DR — Every Wiki-Confirmed Number for Part 4
- Release date: Friday, August 22, 2026. Wiki-confirmed via date_added = August 22, 2026 on all three new item pages (Cornling, Maize Stalk, Eclipse Berry) and via the fourth-part item list on the Harvest Moon Event wiki page.
- Event closes: August 29, 2026. Part 4 is the last new content window before Harvest Moon ends. Seven-day chase.
- Cornling — Legendary pet:
- Hunger: 25,000.
- Passive — Corn Synergy: “Occasionally transfers all mutations on a fruit to a fruit with no mutation. There is a chance that each mutation stays on the original fruit for every Corn planted in your garden.”
- Obtain method: To be determined on the wiki. Price: To be determined. Currently flagged Unobtainable.
- Maize Stalk — Divine crop: Tier confirmed. Multi-harvest? Unknown. Seed chance / seed price / sell value / where it stocks: all TBA. Currently flagged Unreleased.
- Eclipse Berry — Divine crop: Tier confirmed. Multi-harvest? Unknown. Obtainment / price / value: all TBA. Currently flagged Unreleased.
- Moonbeam mutation (baseline the event is built around): 15× value multiplier per the Crop Mutations wiki page. Gold + Moonbeam stack: 20 × 15 = 300×.
- Active Grow a Garden codes on August 19:
torigate(Whispering Torii),BEANORLEAVE10(Green Bean Chamber),RDCAward(RDC Award). Wiki-verified this morning — no launch-day surprise code, and if TikTok claims one on Friday, do not click.
When It Drops & The Seven-Day Chase Window
Every Part 4 wiki page — Cornling, Maize Stalk, Eclipse Berry — carries the same tag: date_added = August 22, 2026. Every page is currently flagged Unreleased (Maize Stalk, Eclipse Berry) or Unobtainable (Cornling). That is how the Grow a Garden wiki flags datamined content: editors and testers can see the assets in the game files ahead of the public push, but nobody in a live server can plant the crop or hatch the pet yet.
The important context around that date is the event window itself. From the Harvest Moon Event wiki page: the event started August 1, 2026 and ends August 29, 2026. That means Part 4 opens the chase and gives you exactly seven days to earn or craft or roll whatever Part 4 gates before the whole event closes.
Seven days is short for a Divine crop grind. The Part 3 launch gave players a full two-week runway to hit the 12-summon Harvest Melon gate; Part 4 collapses that runway by half. If Cornling has any comparable unlock requirement (still TBA), the pacing math changes.
Cornling — The Legendary Mutation-Transfer Pet
Cornling is the marquee reveal of Part 4 and the one wiki page with real content on it. Straight from the Cornling wiki page:
- Rarity: Legendary.
- Hunger: 25,000. That is a middle-of-the-road Legendary hunger value — noticeably higher than Wheat Crow (1,500) but nowhere near Harvest Golem’s 275,000 ceiling from Part 3.
- Passive — Corn Synergy: “Occasionally transfers all mutations on a fruit to a fruit with no mutation. There is a chance that each mutation stays on the original fruit for every Corn planted in your garden.”
- Obtaining method: To be determined.
- Price: To be determined.
- Currently obtainable: No (flagged Unobtainable, will flip on August 22).
The passive is the story. Read it three times before you keep going, because it is not like any other pet passive currently in the game.
Corn Synergy Explained — What the Passive Actually Does
Every existing mutation-related pet in Grow a Garden either applies a mutation (Lunar Moth adds Moonbeam) or increases the chance a fruit rolls one on collection. Cornling does neither — it moves mutations that already exist. Break the wiki text into its two clauses:
- “Occasionally transfers all mutations on a fruit to a fruit with no mutation.” On a proc, Cornling picks a mutated fruit and moves every mutation on it to another fruit in the garden that has none.
- “There is a chance that each mutation stays on the original fruit for every Corn planted in your garden.” For every Corn plant you have, the odds that any individual mutation stays put on the donor go up.
Practically, that makes Cornling a mutation duplicator when paired with Corn. With zero Corn planted, a proc is net-neutral: it empties the donor and hands its stack to a plain one. With many Corn planted, it likely leaves some (or most) of the donor’s mutations behind while the transferred ones land on a previously-plain target — net gain in mutated fruits per proc.
Against Moonbeam — the mutation the whole event revolves around, worth 15× alone and 300× stacked with Gold per the Crop Mutations wiki page — that is a mechanic the game has never given players before. Copying a heavy Moonbeam stack onto a Divine crop like Maize Stalk or Eclipse Berry, while the original often keeps its mutations, is the theoretical endgame.
The obvious build read: plant a lot of Corn. Corn is a Rare, multi-harvest, Fall-type crop from the base Seed Shop at 1,300 Sheckles per seed with a 16% stock chance. It is cheap and available now, and Cornling → Corn is as loud a synergy telegraph as this game has ever put on a pet page.
Proc rate and per-Corn scaling factor are both TBA on the wiki — we will only know after August 22 when players start logging real data. Do not trust any pre-launch TikTok claiming specific numbers.
Maize Stalk — The Divine Crop Paired With Cornling
Straight from the Maize Stalk wiki page:
- Rarity: Divine. Confirmed via the tier icon on the page.
- Multi-harvest: Unknown.
- Seed chance / seed price / restock cadence: To be determined.
- Currently obtainable: No. Flagged Unreleased.
- Date added: August 22, 2026.
Two things worth flagging even with the numbers still TBA. First, Maize is the botanical name for Corn — pairing a Cornling pet with a Maize Stalk crop in the same drop is intentional. Historical precedent (every themed pet-crop pair in the last three events) says Maize Stalk will very likely count as a Corn plant for Cornling’s scaling. Not wiki-confirmed, but strong signal.
Second, Divine is always the highest per-plant Sheckle tier the game ships. Divine + Moonbeam (×15) alone would be the highest per-fruit yield in the game; Divine + Moonbeam + Gold (×300) puts you in Season-7-crop territory. If Cornling can copy a Moonbeam stack onto a Maize Stalk fruit, that is your endgame loop. Seed price stays TBA — do not trust any pre-Friday number.
Eclipse Berry — The Second Divine Crop
From the Eclipse Berry wiki page:
- Rarity: Divine.
- Multi-harvest: Unknown.
- Obtainment: To be determined.
- Currently obtainable: No. Flagged Unreleased.
- Date added: August 22, 2026.
Eclipse Berry is the wiki page with the least content on it. The name is the strongest signal we have: eclipses are a night-and-moon theme, which is consistent with the entire Harvest Moon Event motif, and berries in Grow a Garden are usually multi-harvest (Strawberry, Blueberry, Twineberry, Astral Grape are all multi-harvest). It is a reasonable read that Eclipse Berry will end up multi-harvest as well, but this is inference from naming conventions, not wiki confirmation.
The pairing shape of Part 4 is telling: two Divine crops in one drop is rare. Most Harvest Moon parts have shipped one Divine crop max. Getting two — both with the naming and thematic hooks to pair with the event’s existing Moonbeam farming loop — makes Part 4 the highest per-drop crop value the event has produced. Even if you never chase Cornling, banking Sheckles for both Divine seeds is a defensible Part 4 goal.
What the Wiki Has NOT Confirmed Yet
Every Part 4 page is a live-datamined stub. If a guide, video, or TikTok claims any of the following before August 22, they are guessing:
- Cornling proc rate and the “chance per Corn” scaling factor (percentage, cap, whether it stacks additively or multiplicatively).
- Cornling obtain method (egg? crafting recipe like Wheat Crow and Harvest Golem? direct Moon Coin purchase?) and Robux skip cost.
- Maize Stalk and Eclipse Berry seed prices, stock chances, which shop they stock in, sell values, and multi-harvest status.
- Whether Part 4 has a summon gate like Part 3’s 3/6/9/12-summon Moon Crafting gates. Nothing on the wiki confirms one either way.
Every one of those numbers will appear on the wiki within about 12 hours of Friday’s update — the community fills in date_added, tier, price and stock data faster than anything else.
Pre-Drop Prep — What To Do Between Now and Friday
Everything below is designed to remove friction on Friday. None of it requires guessing at unconfirmed numbers.
- Plant Corn now and buy every restock. Corn is Rare, multi-harvest, Fall-type, 1,300 Sheckles at 16% Seed Shop stock. Cornling scales with Corn count — four mature Corn plants on Friday morning is four multiplier stacks you already own. Planting tonight also means they are already grown, mutated, and producing by launch.
- Bank Sheckles. Two Divine crops in one drop is unusually expensive. Sell Moonbeam-mutated fruits at the Moon Sell Stand this week.
- Stack Moon Coins and hold on to eggs. If Cornling is a Moon Crafting unlock (Part 3’s Wheat Crow needed 20 Moon Coins, Harvest Golem needed 70), you want a cushion. Do not spend down Mythical or Moon Eggs — likely pre-reqs if there is a recipe.
- Hoard your best Moonbeam-stacked fruits. The strongest theoretical use of Cornling is copying a heavy Moonbeam stack onto a plain Divine fruit. Have a donor ready.
- Level a pet to 50 or higher. Part 3’s Moon Machine still runs, and any Part 4 pet mechanics may reuse the same infrastructure.
- Finish Part 3 first. Wheat Crow (3 summons), Wheatcap (6), Harvest Golem (9), Harvest Melon (12) — clear these before Part 4 splits your attention. Full breakdown in our Part 3 launch guide.
Codes Check — What Actually Works on August 19
I re-verified every Grow a Garden code against the official Codes wiki page this morning. The active list is unchanged from Part 3 launch:
- torigate — 1x Whispering Torii cosmetic. Active.
- BEANORLEAVE10 — 1x Green Bean Chamber cosmetic. Active.
- RDCAward — 1x RDC Award cosmetic. Active.
- LUNARGLOW10 — Expired. Wiki lists it in the Expired Codes table. Do not spam it.
Redeem codes by hovering over Settings and scrolling down to the codes section. Full up-to-date list on our Grow a Garden codes page. If a Friday TikTok promises a “secret Cornling code” on launch day, do not click — the wiki mirrors new codes within hours, and there is no such entry as of this morning.
FAQ
What day does Grow a Garden Harvest Moon Part 4 release?
Friday, August 22, 2026. The wiki has date_added = August 22, 2026 stamped on all three new item pages (Cornling, Maize Stalk, Eclipse Berry), and the Harvest Moon Event wiki page lists them in the fourth-part item block.
When does the Harvest Moon Event end?
August 29, 2026 per the event page. Part 4 gives you seven days to earn or craft or roll any Part 4 gated content before Harvest Moon closes.
What is Cornling’s Corn Synergy passive?
Wiki text verbatim: “Occasionally transfers all mutations on a fruit to a fruit with no mutation. There is a chance that each mutation stays on the original fruit for every Corn planted in your garden.” It moves an existing mutation stack from a mutated fruit to a plain one, and for every Corn plant the odds that the donor keeps its mutations rise. Enough Corn turns it into a mutation duplicator.
How rare is Cornling and how many Corn plants do I need?
Legendary tier, 25,000 hunger. Obtain method and price are TBA. The wiki does not publish the per-Corn scaling factor yet, but historical GAG scaling passives usually plateau at 4-8 stacked plants — a safe pre-Friday target is 4+ mature Corn plants, adding more once player data appears.
Are Maize Stalk and Eclipse Berry multi-harvest?
Both are marked “multi-harvest: Unknown” on the wiki. Divine tier is confirmed for both. Berries in Grow a Garden are historically multi-harvest, but that is naming-convention inference, not wiki confirmation.
What are the working Grow a Garden codes for August 2026?
Three active: torigate, BEANORLEAVE10, RDCAward. All cosmetic rewards. LUNARGLOW10 is expired. Full list on our codes page.
Related Guides
- Grow a Garden Hub — game overview, database entry points, and the crop-value calculator.
- Grow a Garden Mutations Guide — how Moonbeam stacks with Gold and other environmental mutations.
- Grow a Garden Codes — re-verified today; three working codes.
- Harvest Moon Part 3 Launch Guide — Wheat Crow, Harvest Golem, and the full Moon Crafting recipe table.
- Harvest Moon Event Base Guide — the Moonbeam mutation, Moongrain Meadow, and the event mechanics Part 4 sits on top of.
- Season Pass 7 Guide — the parallel progression running through Harvest Moon.
Sources
Every rarity, ability line, hunger value, release date, event window and code status above is pulled from the Grow a Garden Fandom wiki via the MediaWiki API on August 19, 2026:
- Cornling page — Legendary rarity, 25,000 hunger, Corn Synergy ability line verbatim, Obtain Method “To be determined,” Price “To be determined,” date_added August 22, 2026, currently flagged Unobtainable.
- Maize Stalk page — Divine tier, multi-harvest Unknown, obtainable No, date_added August 22, 2026.
- Eclipse Berry page — Divine tier, multi-harvest Unknown, obtainable No, date_added August 22, 2026.
- Harvest Moon Event page — event window August 1 to August 29, 2026, fourth-part item list confirming Maize Stalk Seed, Eclipse Berry Seed and Cornling as the Part 4 additions.
- Crop Mutations page — Moonbeam row (value 15, multiplier 15×) and Gold + Moonbeam combined stack (20 × 15 = 300×).
- Corn page — base Seed Shop entry (Rare rarity, multi-harvest, 16% stock chance, 1,300 Sheckles / 135 Robux / 135 Trade Tokens per seed) used to anchor the “plant Corn now” prep step.
- Codes page — torigate, BEANORLEAVE10, RDCAward listed as Active on August 19; LUNARGLOW10 listed as Expired.
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