Iris bulbs growth speed

tommilakFebruary 12, 2010


I'm growing Iris reticulata and Iris danfordiae bulbs inside. They have now been growing about 2 weeks and they have only grown about 1-2 cm and some of them less than 1 cm. Is this speed normal, because it seems to me that it's taking forever for them to grow. Maybe someone has experiences growing iris bulbs inside? How long did it take your bulbs to start blooming?

Thank you for reporting this comment. Undo

never had experience wtih those kinds myself, but you might ask on the Iris Forum.

Best luck!

    Bookmark   February 13, 2010 at 5:43PM
Thank you for reporting this comment. Undo

I'm not sure I correctly understand the situation :-) Did you just plant the bulbs 2 weeks ago? Had they been chilled at all? Are you attempting to force them or is there another reason for growing them inside?

The little bulbous iris are some of the earliest of the spring flowering bulbs to appear. But outdoors, they typically get planted at the same time as any other spring bulb - they need the winter chill period to vernalize and time in the ground to develop a root system. Growing them indoors does not eliminate those same requirements - a chill/vernalization period and sufficient time to develop roots. And that doesn't happen in two weeks.

Can you explain your intentions and processes a bit more and maybe I can give better guidance.

    Bookmark   February 14, 2010 at 8:18AM
Thank you for reporting this comment. Undo

Of course I chilled them. About one month. I brought them to a warmer and lighter place when the stems were about 5 cm tall and I checked that they had a good root system.

    Bookmark   February 15, 2010 at 5:37AM
Thank you for reporting this comment. Undo
Chemocurl zn5b/6a Indiana(zone 5/6)

Per the link below for weeks of cold period
Iris reticulata
Iris danfordiae

Water the pots thoroughly when bringing them inside. Place pots in a cool area of the home (high light intensity is not important at this point) and leave pots in a cool location until active growth is visible. Take care not to over-water. Once active growth begins, you can move the pots to a warmer location that receives more light. Forcing bulbs slowly is more desirable than placing them directly in a bright, warm location. The quick transition from chilling to warm temperatures can sometimes "blast" the buds, which means everything moves too fast and the bulbs do not bloom.

My guess is that the danfordiae were not chilled long enough. Waiting until they were 5 cm (almost 2") was maybe waiting a bit too long.


Here is a link that might be useful: Forcing Bulbs-Fact sheet from the University of RI

    Bookmark   February 15, 2010 at 9:46AM
Sign Up to comment
More Discussions
Any idea what these are going to be?
I was cleaning up a small garden left over from our...
(Cheap) Alternatives to Peat Moss
I need to store some bulbs over the winter and wonder...
What part of a bulb do deer eat
I realize deers eat bulbs, but do the eat just the...
Poll: share what is blooming for you!
My brother in Zone 8 has daffodils blooming! What...
Anyone growing Dutch Iris ?
Is anyone growing or has anyone grown Dutch Iris ? What...
Sponsored Products
IRIS Critter Carrier - 301190
$24.99 | Hayneedle
Fleur De Lis Doorbell Ringer
Signature Hardware
Patch Magic Iris Toss Pillow 16 x 16-Inch
$43.00 | Bellacor
Madeleine Pendant by LBL Lighting
$140.00 | Lumens
72"L x 44"W x 31"H Garden Classic Iris Poly Lumber Rectangular Dining Table
Pixhawk Autopilot System
$199.99 | FRONTGATE
Indoor Area Rug: Iris Grey/Black 5' x 7' 6"
Home Depot
Max Coax Pendant by LBL Lighting
$188.00 | Lumens
© 2015 Houzz Inc. Houzz® The new way to design your home™