Commercial grade Osmocote slow release fertiliser pellets, 5gram size, for pots and hanging baskets etc.
Feeds over the season for 5-6 months. Just pop into the surface compost when potting up, or to liven up struggling plants. We have used these for years on our own nursery. Box of 25 plugs.
Pot size up to 12cm width use 1 pellet, 13-20cm width use 2 pellets, above 20cm width use 3 pellets