fertilizing siberians

shelleyh(z5 NY)April 20, 2014

I put some Siberian irises in last year. Should I fertilize them and with what?

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iris_gal(z9 CA)

Good idea to fertilize after spring growth has begun. I like to use low nitrogen (ie. 6-10-8) for ones in the ground. Potted bulbs and iris get Miracle Grow which is higher nitrogen.

    Bookmark   April 23, 2014 at 2:56AM
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harryshoe zone6 eastern Pennsylvania

I sprinkle Plant Tone around them in early spring. For a vigorous cultivar like Caesar's Brother, that seems to be enough.

This year, I may try a second feeding with something stronger for some of the less vigorous ones.

I have never heard SI described as heavy feeders. However, some of the varieties I have just seem like they need a little kick. Probably just after they bloom.

    Bookmark   April 24, 2014 at 1:41PM
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