How many plots does the Greenhouse have?

Three plots, one trellis. You can plant up to three seeds; the trellis is decorative.

What does the White Iris reward?

A permanent +1 Gem to your daily payout, plus a one-time 5-Coin bonus on first bloom.

What if I water in the wrong order?

The plants wilt by Turn 5. You can re-seed on a future Greenhouse visit, but the day's bloom attempt is lost.

Do I need seeds in inventory?

No. The Greenhouse provides Rose, Lily, and Iris seeds on its workbench. Bringing your own seeds adds Tulip and Orchid options but does not affect the White Iris recipe.

Blue Prince Greenhouse — Seed Order & White Iris Bloom

Updated May 25, 2026 · 7 min read · Rare bloom solution

The Greenhouse is the slowest-paying room in Mt. Holly. You plant three seeds, water across three turns, and only on Turn 4 does something happen. Most players give up on Turn 2 and re-draft. They shouldn't — the Greenhouse's rare bloom, the White Iris, is a permanent +1 Gem to your daily payout. That's better than the Pantry, better than the Library, and only second to the Laboratory's Coin Press formula.

Solution overview: Plant Rose in Plot 1 (left), Lily in Plot 2 (center), Iris in Plot 3 (right). Water in order: Turn 1 Plot 2, Turn 2 Plot 3, Turn 3 Plot 1. Turn 4: the Iris transforms into White Iris.

Greenhouse Layout

Three plots, three seeds. Water in middle-right-left order across three turns.

Why the Plot Assignment Matters

Each plant has a light requirement that the Greenhouse satisfies in only one plot:

Rose — Plot 1 (shade). The west wall trellis shades Plot 1 across all four daily light cycles. Roses planted anywhere else dry out by Turn 3.
Lily — Plot 2 (mixed). Plot 2 gets indirect light. Lilies tolerate both and serve as the "trigger" plant — watering it first wakes up the soil pH for the other two.
Iris — Plot 3 (sun). Iris is the only plant that survives full-day sun in this room. Plot 3 is sun-locked.

Plant in any other arrangement and the plants survive the first day but die overnight — the Greenhouse won't tell you, you'll just find dead stems on Day N+1.

The Water Order

Turn 1: Water Plot 2 (Lily). The Lily sprouts immediately and changes the soil pH for adjacent plots.
Turn 2: Water Plot 3 (Iris). The Iris germinates. Note: do not water it on Turn 1 — Iris germination without Lily-treated soil makes it a regular blue Iris, not a rare White Iris candidate.
Turn 3: Water Plot 1 (Rose). The Rose germinates last. By now, the Lily has gone to seed and the Iris is mid-bloom.
Turn 4 (no action): The bloom triggers. If everything was correct, the Iris in Plot 3 visually morphs from blue to white. A short cinematic plays.

The Lily-first rule: The single most-missed step is watering Plot 2 (Lily) on Turn 1. The center plot is the trigger — without it, the bloom never happens regardless of the other two.

White Iris Rewards

+1 Gem per day, permanent. Written to the save file. Persists through deaths.
One-time 5-Coin bonus on first bloom of each save file.
"Botanist" achievement on Steam / GOG.
The Iris stem is collectable as an inventory item — places it in your hat band and unlocks one cosmetic for your character portrait.

Re-Visiting the Greenhouse

Once the White Iris has bloomed on a save file, the Greenhouse becomes a Coin-printing room. Each subsequent bloom (same recipe, same order) gives 3 Coins. You can re-draft the Greenhouse and re-execute on every run for guaranteed payout. The +1 Gem perk does not stack — only the per-bloom Coin payout.

Common Mistakes

Swapping Rose and Iris. Players assume "shade Iris, sun Rose" because Iris looks delicate. Reversed.
Watering all three on Turn 1. The Greenhouse only gives you 3 water charges, but using all on Turn 1 doesn't trigger the bloom cascade. Spread them across turns.
Skipping Turn 4. Some players leave the room after watering Plot 1, thinking the puzzle is solved. The bloom triggers only if you're still in the room when Turn 4 rolls. Wait one extra action.
Drafting Greenhouse on Day 1. Day 1 has too little time for a 4-turn process. Reserve Day 2+ for the Greenhouse.

Greenhouse FAQ

Do I need to bring seeds? No. The Greenhouse's workbench provides one each of Rose, Lily, and Iris.

What about Tulip and Orchid seeds? Tulip and Orchid are alternate bloom recipes (Yellow Tulip for +1 Step/day, Black Orchid for +1 Key/day). Different seed sources required.

Does the bloom persist if I draft Greenhouse again? The +1 Gem perk persists permanently. The Greenhouse itself re-spawns in the draft pool normally.

Does the puzzle lock me into the room for 4 turns? No. You can leave between waterings. But you must return to the same Greenhouse tile to water on subsequent turns — drafting a new Greenhouse resets progress.

Puzzle

Laboratory — 7 Formulas

Element mixing for permanent perks.

Read solution

Reference

All Rooms List

Every room — Greenhouse rarity, draft odds.

Room database

Strategy

Resource Economy

Why +1 Gem/day compounds across runs.