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Leech Seed cannot newly affect a Pokémon that is currently Grass-type in the core Pokémon games. That immunity applies when Grass is either the Pokémon’s only type or one of its two types. The important exception is timing: a Pokémon that was seeded before it gained Grass typing keeps the existing condition, so seeing a Grass-type lose HP to Leech Seed is possible without contradicting the rule.
The answer below covers the core-series mechanic, the type-change and Baton Pass edge cases, and the generation-specific amount of HP transferred each turn. Spin-off games can implement battle rules differently, so identify the game before extending this conclusion beyond the main series.
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Can Leech Seed affect a Grass-type Pokémon?
No. In the core Pokémon games, a Pokémon that is Grass-type when Leech Seed is used is immune to a new Leech Seed condition. The move fails to seed that target rather than applying a weaker version of the effect. Grass-type battle properties list this as a specific immunity, and the seeding mechanics reference describes the same application rule.
That remains true for dual-type Pokémon. A Water/Grass, Poison/Grass, or any other combination containing Grass is still Grass-type for this check. The game does not treat the second type as a reason to bypass the immunity.
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Why does Grass typing block Leech Seed?
Leech Seed is a non-damaging Grass-type move introduced in Generation I. Its interaction with a Grass-type target is governed by a dedicated type immunity, not by the ordinary damage chart. Because the move does not deal direct damage, there is no “reduced Grass damage” calculation that lets the effect through; the attempted seeding is rejected at the application step. The move’s reference entry identifies its type and non-damaging classification.
This distinction helps explain several otherwise confusing battle results:
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- A Grass-type does not become seeded at reduced strength.
- Adding Grass as a second type is enough to block a fresh application.
- Removing Grass later does not turn an earlier failed attempt into a successful one.
- The immunity concerns putting the condition on the target; it is separate from how much HP an already active condition drains.
In practical terms, check the target’s type at the moment Leech Seed resolves. If Grass is present then, the move cannot establish the condition.
What if a Pokémon gains Grass type after it was seeded?
Gaining Grass type does not retroactively erase an existing Leech Seed condition. If the target was legally seeded while it lacked Grass typing, it remains seeded after a type-changing effect or a species change gives it Grass type. The immunity blocks new application; it is not a cleansing effect. The documented seeding rules expressly distinguish these two situations.
Use this timeline to interpret an apparent exception:
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- Before the type change: the target is not Grass-type, so Leech Seed succeeds.
- After the type change: Grass is now one of the target’s types, but the existing condition remains active.
- Any later attempt: another Leech Seed attempt against that currently Grass-type target fails, even though the first condition is still draining HP.
The same logic applies when a Pokémon changes species or otherwise changes its type during battle. The relevant question is not “Is this Pokémon Grass-type now?” but “Was it Grass-type when this particular Leech Seed attempt was made?”
Can Baton Pass put Leech Seed on a Grass-type?
Yes, under the core-series seeding rules, Baton Pass can transfer an existing Leech Seed condition to a replacement that is Grass-type. That does not mean Leech Seed successfully targeted the Grass-type. The condition was created on the original recipient and then carried to the incoming Pokémon as part of the transfer effect.
This is the clearest explanation for a Grass-type arriving on the field already losing HP to Leech Seed. The incoming Pokémon’s Grass typing prevents a new use of the move, but it does not invalidate a condition that was transferred to it. Treat “newly seeded” and “already carrying the condition” as separate states when reading a battle sequence.
How much HP does Leech Seed drain each turn?
Once Leech Seed has successfully been applied, the core series removes a fraction of the target’s maximum HP at the end of each turn and restores that amount to the opposing position associated with the Pokémon that caused the condition. The fraction depends on the generation:
| Core-series era | Drain per turn | What the fraction means |
|---|---|---|
| Generation I | 1/16 of the target’s maximum HP | The original-generation rule documented for Leech Seed |
| Generation II onward | 1/8 of the target’s maximum HP | The standard fraction used in later core games |
These are maximum-HP fractions, not fixed points of damage. A higher-HP target therefore loses more HP per turn than a lower-HP target under the same generation’s rules. The recovered amount is credited to the opponent occupying the position linked to the Pokémon that caused the seeding, as described in the core mechanics documentation.
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The drain value does not weaken merely because the target is Grass-type after a type change. If the condition already exists, the normal fraction for that game generation continues to apply. Conversely, a Grass-type that was never successfully seeded loses nothing from Leech Seed because there is no condition to process.
Is Grass-type immunity the same as resisting Leech Seed?
No. Resistance usually changes the amount of damage a move deals; this interaction prevents the status-like condition from being established at all. Since Leech Seed is non-damaging, the type chart’s damage multipliers are not the reason for the result.
That difference matters when diagnosing a battle. If the target was Grass-type when the move was attempted, there should be no newly active Leech Seed effect to track. If HP is being lost, look for an earlier successful seeding, a type change after seeding, or a transferred condition rather than assuming Grass resistance reduced the drain.
How should you read a Leech Seed sequence in battle?
Follow the events in order instead of judging only the target’s final type. This four-question check resolves most apparent contradictions:
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- Which game is this? Confirm that the title uses core-series rules. The references document the main-series mechanic, not every spin-off implementation.
- What was the target’s type when Leech Seed was used? If Grass was present as either type at that moment, the fresh application was blocked.
- Did the target already carry Leech Seed? A condition created before a type change can continue after the target becomes Grass-type.
- Was the condition transferred? Baton Pass can move an existing condition to a Grass-type replacement, making the replacement appear to violate the immunity when it did not.
This timeline-based approach is more reliable than treating “Grass types are immune” as shorthand for “Grass types can never display the Leech Seed condition.” The precise rule is immunity to new application.
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Does the rule change for dual-type Pokémon?
No. The presence of Grass in either type slot is sufficient for immunity to a new Leech Seed application. A dual-type target does not need Grass as its primary type, and the other type does not cancel the protection.
For example, if a target is Fire/Grass when the move resolves, it is still covered by the Grass-type immunity. If it begins as Fire-only, is seeded, and later becomes Fire/Grass, the existing condition follows the type-change rule instead: it remains active while future attempts are blocked.
Does this work the same way in every Pokémon game?
The “Grass types cannot be newly seeded” answer is supported here for the core series. Pokémon spin-offs may use their own battle engines, status rules, or move behavior, so do not assume that a spin-off reproduces the exact immunity or drain timing without checking that game’s documentation.
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Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Common mistakes when checking Leech Seed
- “The target is Grass now, so it could never have been seeded.” It may have gained Grass after the condition was applied.
- “A dual-type Pokémon is only immune if Grass is listed first.” Either type slot is enough.
- “The move dealt low damage because Grass resists Grass.” Leech Seed is blocked by immunity to application; it is not ordinary reduced damage.
- “A Grass-type replacement proves the move worked on Grass.” Baton Pass can transfer an existing condition to that replacement.
- “Every Pokémon game uses the same fraction.” Core-series generations differ, and spin-offs require title-specific verification.
When a battle log appears to conflict with the rule, reconstruct the type and condition state at each event. That usually reveals that the move was attempted before the Grass typing, or that the condition arrived through a transfer rather than a direct hit.
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Frequently Asked Questions
Why is my Grass-type losing HP to Leech Seed after switching in?
The condition may have been transferred to it rather than applied directly. In the core series, Baton Pass can carry an existing Leech Seed condition to a Grass-type replacement, so the replacement can lose HP even though a fresh Leech Seed attempt against it would fail.
Can a Pokémon be seeded before a type-changing effect makes it Grass-type?
Yes, provided it was not Grass-type when Leech Seed resolved. The later type change does not remove the condition that was already established; it only prevents subsequent new applications while Grass remains one of the types.
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1Fix the driver behind crashes, sound loss and screen glitches2Clear out junk files and repair common Windows errors3Scan for outdated or missing drivers - takes under a minuteWhy do old guides list a different Leech Seed drain amount?
The core-series fraction changed by generation. Generation I documentation lists 1/16 of maximum HP per turn, while Generation II and later documentation lists 1/8, so a guide written for an earlier game may be accurate for that generation but not for a newer one.
Does a spin-off game definitely give Grass types the same immunity?
Not necessarily. The cited rule is a core-series mechanic, and spin-offs can implement moves and type interactions independently. Check the specific spin-off’s battle documentation before using the main-series answer.
