Mega Fertilizer Grow a Garden – Fertilizer Guide, Effects & Cost
Quick Overview
How It Works
Premium fertilizer that boosts both growth speed and harvest yield for 30 minutes.
Fertilizers do not stack. Applying a new fertilizer will replace this one. Only one fertilizer can be active on a crop at a time.
How to Get Mega Fertilizer
- Gear Shop
- Premium Rewards
Tip: Gear Shop stocks refresh periodically. If you don't see this fertilizer in stock, check back after a refresh or watch for it during special restocks.
Strategy Tips
Apply to multi-harvest crops like Tomatoes or Blueberries to maximise the number of harvests per session.
Combine with growth-boosting pets for compounding speed bonuses.
Use during longer play sessions so you can benefit from multiple harvests within the duration window.
Best used on multi-harvest crops where each extra yield compounds across multiple harvests.
Pair with a Harvest-speed sprinkler to maximise the number of harvests during the active window.
Although it only lasts 30 minutes, the combined growth + yield boost is extremely powerful for short farming bursts.
Best used when you can stay active and harvest rapidly during the entire 30-minute window.
Remember: fertilizers cannot stack with each other. Only one fertilizer can be active at a time per crop.
Related Fertilizers
Community Notes
This fertilizer guide is based on the latest Grow a Garden update. Effects, costs, and availability may change during special events or game updates. Fertilizer behaviour (especially Silver Fertilizer's permanent-application chance) is community-verified and may vary slightly between sessions.
March 2026