L. jankae is apparently an enigma, as I haven't found a definitive answer for its germination mode, either. It has always been thought to be most closely related to L. carnicolicum (also I have listed as "DH maybe"). But a more recent DNA study has placed it closer to L. rhodopaeum, which is definitely DH.
http://www.the-genus-lilium.co...
L. formosanum var. pricei is IE, but in most people's experiences, including mine, the seed still needs a cold-moist treatment to germinate. The freezer is a great place to store lily seed, but it will not suffice for this cold
and moist treatment. You must plant the seeds (or put them in a moist medium) and place them in a 1-5C temperature. I am guessing for a minimum of 4 weeks.
i have tried L. mackliniae seed three times with seed exchange seed from plant societies and they have never emerged. I have talked with Peter Korn about this and he said he has observed L. mackliniiae seed germinating while still in the seed pod. He suspects my seeds were already dead. Last late winter (almost a year ago), I received some fresh seed from someone in New Zealand (when it is summer there). I planted them soon after, and they are the only ones that have grown.
So I would be sure to plant the L. mackliniae seed now.
An excerpt from Darm Crook's published findings:
L. pyrenaicum - I have found that a few seeds will germinate within 60 days after being frozen for a couple of weeks the majority will not. After a three month incubation period at temperatures around 15C. I give them a three month period at +2C. Then plant them out germinated or not. The ones that had germinated will sprout their cotyledon shortly after being planted out. The rest that are viable will sprout their cotyledon the following spring. Thus they germinate through the summer, it seems like this lily's seeds may require two cold periods before they will properly germinate and sprout their cotyledon.
The following specie seeds are immediate hypogeal cool germination. If held at temperatures of 9 to 11C. they will sprout their first true leaf about 60 to 80 days after the seed has germinated and the bulblet is well formed.. If held at warmer or colder temperatures the seeds may never germinate but if they do the true leaf may never sprout. The planting medium should be just moist, if it's to wet the seeds will refuse to germinate. They should not be potted up until the true leaf is sprouted and a root system has at least started to develop. These species seeds which I have grown will germinate as follows.
L. bolanderi - 30 to 60 days
L. columbianum - 30 to 60 days. Some of it`s seeds will germinate as delayed hypogeal.
L. humboldtii - 30 to 60 days.
L. kelloggii - 35 to 90 days.
L. pardalinum - 30 to 75 days.
L. parryi - 45 to 80 days.
L. parvum - 30 to 60 days. Some of it`s seeds will germinate as delayed hypogeal.
L. pitkinense - 30 to 60 days.
L. rubescens - 40 to 80 days.
L. washingtonianum 40 to 75 days.
L. wigginsii - 30 to 70 days.
Darm Crook
Hay River, Northwest Territories,
Canada
Zone 1 Canadian scale.
You'll want to sow the DH seed so they can germinate in the warm 60-70F (15-20C) and have 3 months to develop in warm before the cold treatment. if you plant in late summer, you will need to bring them inside to complete the 3 months. Many of us do do this. The other option is to plant in spring and let the seed develop underground during the summer, and then receive the natural cold treatment in winter outside.
All lily seeds are naturally dispersed by wind. Consequently, growers take the hint from nature and surface plant or plant very shallowly. While this is not so exacting with hybrids, the species are more particular. I surface sow and cover with 5-10mm of #2 grit. You could substitute 5mm of vermiculite or 10mm of perlite. Soecies are more particular about good drainage, too.
First I want to be sure - when you sift the sand, you are keeping the larger granules and throwing out the tiny granules.
From what you have to use, I think 2 parts potting mix, 1 part sand, 1 part perlite. Nothing is set in stone, so you don't have to be exact. Always err on making the mix too light rather than too heavy. Remember, with species you are likely to keep them in the same pot for
at least 2 years, and you don't want the soil to compact too much.
