Feed pelargoniums well.
• Substrate EC (SME): 1 .5―2.1 mS/cm • Provide plant with 200―250 ppm of nitrogen. • Do not use too much phosphorus! • Suitable NPK rate: 15 - 5 - 15, 15 -3- 15 15 - 5 -10, 18- 5 - 15, 17 - 5 - 17. • Give fertilizers with every watering. • Check Fe and Mn concentration. • Suitable NPK rate at flower bud emergence: 15 - 5 - 25, 15 -3- 25 15 - 5 -30, 18- 5 - 35, 17 - 5 -40 – generative NPK.
Proper NPK rate
• Do not use 15-15-15 or 17-17-17! • Do not use ureum (NH2)2CO! • Do not use clean water (without fertilizers). • Do not use dry fertilizers
Fe & Mn toxicity.
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