I had a pot of indoor dwarf iris given to me as a gift. The flowers have now died so I dead-headed them, but now they have gone crazy and the plants have grown to around 35cm. What do I do with them now?
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Per this site,
Irises cannot be forced a second time indoors. If you want to keep them, allow the foliage to die back naturally, cut off the stems, then store the bulbs in a cool, dry place. Plant the bulbs in a sunny site with well-drained soil in the fall. Dwarf iris plants are hardy to Zone 5 and naturally bloom in early spring.
www.guide-to-houseplants.com/
I am not sure if you can grow these outdoors or not. If you can then after this growning season and the flowers and leaves dry off naturally move them outside next spring. Allow them to grow outdoors. it is not such a good idea to trim them back. I have done this and I have never had an issue. My plants grow year round because I live in he tropics.
I am not an 'Iris' expert but I have gained some knowledge due to being given a very nice yellow Iris bulb last year.
Dwarf Iris are said to grow up to 5-6 inches so I'm not sure you have a true 'dwarf' Iris.
You do not say where you live or if you have an outdoor space to plant your Iris so any suggestion could be erroneous for your location.
If you have yard space to plant outdoors then you can check this chart to see if Iris can grow outdoors in your zone. Iris is stated to be hardy zone 3/5-9 but there are exceptions - especially if you store your bulbs inside during the very cold months.
planthardiness.ars.usda.gov/
If you cannot plant outdoors then I would suggest you just leave your plant alone until fall and then decide what to do with it as bulbs need a cold area part of the year.
If you have space, it's possible you could transplant it to a larger pot (with good drainage).
Hardy in zones 3-9, they need a winter chill to thrive. If you live in a warm zone, you can chill the bulbs before planting to mimic the effect of winter. In cooler zones, they are easy-care, long-lived bulbs that will multiply and return year after year.
"Dwarf Iris bulbs will flower in the early Spring. After the flowers die down, the plant can enjoy a warm rest period. You don't have to water too much during this rest period. Leaves will also die back and start to yellow. At this point, you can choose to tidy up the plant and remove the old leaves."
Be sure to divide your Iris and replant outside or into more pots.
here is a good site to learn about Iris.
www.leafari.com/
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