Starsand Island Farming Guide: Crops, Gmax, Flowers & Paddy

Farming in Starsand Island follows the clear → plant → water → harvest loop the developer describes, but almost every question players ask sits one layer deeper: which field type a crop wants, how sprinklers and fertilizers scale, what the Gmax odds really are, how the flower colour chart works, and whether the 65,000g greenhouse is worth it. This page answers those with the numbers that are actually in the game data and the community tests, and flags the few that rest on a single report.

Field, fertilizer and seed figures come from the game’s shop and seed strings (which include Version 1.0 entries); greenhouse size, sprinkler coverage and Gmax field tactics are Early Access player findings that we are re-checking for 1.0.

Field types

Players note the quest line never teaches paddy fields; you unlock them late, purely by buying the Powered Hoe. A March 2026 patch stopped weeds spawning in paddies.

Crops and seasons

The developer puts the crop count at “nearly 100”, and the seed data lists 217 seed items including Immortal variants, so a full table is beyond this page; what the sources let us state reliably:

An Early Access patch also fixed out-of-season seeds arriving by mail in winter — a reminder that seeds are season-locked outside greenhouses and Immortal variants. Grape seeds are not priced in any of our sources; grapes matter as Juicer input (Green and Red Grape Juice — the green one is a stacking mining buff) and for Delphin’s 30-grape outer-sea quest, so we note them as Unconfirmed as of August 23, 2026.

Watering and sprinklers

• Watering is manual at first. Sprinkler I covers a reported 2×2 and Sprinkler II a 4×4 (single Reddit report, not yet cross-checked).
• Sprinkler II needs a Mini Reactor and Sprinkler III a Perpetual Reactor — both products of the Energy Converter, so sprinklers are gated by your Crafting progress. Recipes on the machines page.
• Patch history worth knowing: sprinklers were once switched off by default after an update and when the game was closed right after placement (fixed 0.5.3241); Auto Fertilizer Boxes could not be placed on farmland (fixed 0.3.6743).
• Bees rushing growth and paddy fields needing no water are the two ways late-game players skip watering entirely — see the money guide.

Fertilizer line

Gmax crops

Each season has one Gmax crop: Pineapple (Spring), Watermelon (Summer), Pumpkin (Autumn), Winter Melon (Winter). Plant nine in a 3×3; when the last one matures the game rolls whether they merge into a giant crop. Chop the giant with an axe to get Giant (or rarely Golden, 888g) fruit plus a seasonal Fragment, the ingredient for fruit-themed furniture and the old Pumpkin Coins exchange. Community tactics: a bigger field gives more chances (3×6 = four possible blocks, 6×6 = sixteen; one player reports a third of a 15×15 going giant with no fertilizer); put one Gmax Fertilizer on the centre plant so it covers every possible block; use Ripening Fertilizer on the straggler, then fertilize; bee growth bursts speed the cycle. Gmax crops have no Immortal version. The Intermediate Farmer trial asks for a Gmax crop and its Fragment, and the Expert trial for two pieces of matching fruit furniture — see the trials guide.

Greenhouse

The Greenhouse Building Manual costs 65,000g at the Happiness Seed Shop and requires Expert Farmer; you place it from Build Mode (Production → Farming), not the Worktable. Materials are a single report only — 66 Glass and 44 Alloy to start, more Alloy per extension — so treat that as reported. It is four tiles wide and can only be lengthened; a second greenhouse placed alongside merges into one; till the interior before placing it, because the middle column cannot be hoed afterwards. It lets you grow any crop in any season but does not stop weeds, bugs, snails or frost — your rabbits, chickens and ducks will work inside, as do robots and sprinklers. Early Access patches fixed crops withering inside at season change. Community consensus: once you hold the Expert Farmer perk that lets crops grow in all seasons, the greenhouse is close to redundant.

Flower breeding chart

Leave one empty Farmland tile between two flower beds; when they mature or are harvested, a new colour can appear in the gap. Base seeds are Red, Yellow and Blue (Senior Farmer tier).

Nutrient Soil IV/V raises the odds and stacks. The Grinder (Senior Farmer, 7,500g) turns flowers back into seeds but needs a Moo Ball from a bull; the Fairy Musk Deer gifts rare-colour seeds daily. The Senior Farmer trial wants twelve flowers of each colour. Black flowers sell for 417g.

Immortal Seeds

Official name “Everlasting Seeds that never stop growing”: plant once and the crop regrows forever on its normal cycle, in any season on Farmland. Main source is the Starsand Grinder (Expert Farmer, 40,000g; built at Worktable III) with a recipe of 5 normal seeds + 4–8 Lunar Core + 8–15 Honey + 5–10 Protein Powder. Lunar Core comes from Moonstone smelted in Furnace III with Oilstone, and Moonstone is only in the deepest Moonlit Forest zones — that is the bottleneck. They also drop from field and treasure chests, from harvests with the Earth’s Bounty skill, and Mirthshroom Soup plus a Farmer perk raises the drop rate. The 102 Immortal seed entries in the data cover ordinary crops, not Gmax. Lunar Core and Moonstone are detailed on the wood and plant resources and ore locations pages.

Weeds, bugs, snails and farm stones

• Rabbits remove weeds, chickens eat bugs (Trellis), ducks eat snails (Paddy) — five jobs a day each by default; Luna Rabbit and Golden Chicken do 15; the Workaholic trait adds 3–5 and the King trait adds 10. See the breeding guide.
• Blue Scarecrow blocks bugs; Weed Barrier blocks weeds — sources disagree on its blueprint — one listing says 550g (Junior), another 1,800g (Intermediate); we lean to the shop listing at 550g.
• Farm stones and debris: the opening step of the official farming cycle is clearing weeds and rocks; stones are gathered by digging or pickup and sell as a basic material.
• Unplot soil: hit tilled soil with the pickaxe, 2 stamina per tile.
• A patch stopped bamboo regrowing on Cloudrest Lake farmland after cutting.

What is the best crop to grow?

By sell value, King Water Chestnut and Zapweed at 598g, both paddy crops; by effort, Stardew Fern (488g, all seasons). For fertilizer-free giants, a large Gmax field.

Do I need the greenhouse?

Only if you want out-of-season crops before the Expert Farmer all-season perk; it costs 65,000g plus reported 66 Glass and 44 Alloy and protects against nothing but the calendar.

How do I get black flowers?

Brown first (two different secondary colours, or Blue + Orange), then Brown beside any other colour with an empty tile between, ideally with Nutrient Soil on both.

Related guides

• Money-making guide
• Animal breeding guide
• Machines and crafting stations
• Expand your farm and house
• Trials guide

Last reviewed: August 23, 2026 — sources: game seed, shop and machine data export, official Steam announcements and patch notes, Steam community flower-breeding guide, Reddit Gmax and greenhouse threads.