FERTILIZATION & IRRIGATION GUIDELINES The most important thing with Hellebore is to keep them growing during the year. Never stop fertilizing for any reason. Hellebore need a steady feed throughout the growing cycle with an EC of 1.2-1.5, measured directly in the soil.A slow release 8-9 month fertilizer is recommended when spring planted. In the fall, Hellebore start initiating flowers so they need extra Nitrogen (N) and Iron (FE) during this time.This can be supplied using a liquid drench, keeping EC levels at 1.2-1.5.
Macro-elements
PPM MMOL
Micro-elements
PPB UMOL/L
NH4
<1.9
<0.1
Fe
558
10
K
47
1.2
Mn
110
2.0
Na
<58
<2.5
Zn
131
2
Ca
40
1.0
B
108
10
Mg
7.3
0.3
Cu
44
0.7
NO3
155
2.5
Mo
<9.6
<0.1
Cl
<89
<2.5
S
58
0.6
HCO3
<6.2
<0.1
P
15
0.5
K/Ca
1:2
1:2
**Keep in mind; these are not fixed numbers, just guidelines.
The method of watering is very important for Hellebores to avoid stress. Drip irrigation works best but overhead irrigation with feed is also possible.With overhead irrigation, try to avoid watering during the hottest hours of the day because the leaf temperature is high and the water temperature much cooler. Leaf temperatures can go up to 105°F while in most cases the water temperature is around 75°F. This difference creates a temperature shock and causes stress. Stress will weaken plants and make them vulnerable to root problems such as Pythium, Rhizoctonia and Phytophthora.When watering using overhead irrigation on warm days, irrigate only in the early morning or late evening.
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