Cal-BOOST

Delivering nitrogen, calcium and magnesium exactly when plants need it.

20

N

5

P2O5

5

K2O

7.0

CaO

2.0

MgO

Cal-BOOST is a sustainable calcium, nitrogen and magnesium fertiliser designed for sustainable growing media. Its coated granules provide a steady nutrient release for up to three months, helping prevent hidden deficiencies and support consistent plant growth. Ideal for bedding plants, container-grown crops and young plants, Cal-BOOST promoted stronger roots, improved plant health and reliable crop quality.

  • Supports crops during nitrogen drawdown in sustainable growing media.
  • Delivers essential calcium & magnesium for stronger growth.
  • Supports plant health and consistent crop development.
  • Simple, reliable addition to your current programme.

1
Check the growing media - use in sustainable growing media mixes where nitrogen drawdown or low calcium/magnesium may be an issue.
2
Choose the rate - apply 1g per litre for CNS, pot & bedding, and soft fruit in containers. Use 0.5g per litre for sensitive crops, greenhouse crops, and in warmer or indoor situations.
3
Apply correctly - mix into the media or apply as a top dress & water directly after application.
4
Keep the programme balanced - use alongside standard Osmocote rates.

Resources

Article

Sustainable Fertilisers at HTA National Plant Show 2026

Event

National Plant Show 2026

Podcast

Future proofing fertilisers for ornamental plant growers | Podcast
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