I've picked up most of my alstro's at mass merchandisers like Lowe's, and a couple even at grocery stores, around the spring holidays, particularly Mothers Day, when they sell them as blooming potted plants. When I see a color I don't have, I buy it. I also have the dwarf agapanthus. It has proven completely hardy here for me, and has the nicest dark blue blooms in July. Another plant not in its zone but which has come back long-term and bloomed for me is Crinum.

Hi, finally catching up on all these great responses. It is a gorgeous flower and worthy of much conversation. I discovered it only insofar as it was a component of a wildflower seed mix from American Meadows that I sowed on a late afternoon just before a snowstorm in December 2016. By Spring 2018 many gorgeous perennials and biennials had grown from that seed packet, including our beloved blue flax. On the American Meadows page, it calls it "Linum perenne" but elsewhere says "This species is named "lewisii" in honor of Meriwether Lewis..." so I'm not sure if it's L. perenne, the old world native, or L. lewisii, the American native. But apparently sometimes L. lewisii is called L. perenne var. lewisii just to make things interesting. Yeah, I wouldn't be surprised if it was a drainage issue, though many plants right next door to it made it through the winter just fine. (A notable exception was a Penstemon 'Prairie Dusk', and of course all penstemon need really good drainage.) Katob, good eye with noticing the Siberian Wallflower growing right next to it, and it came in the same seed mix. Apparently depends on the growing conditions it can act either as a biennial or a perennial, and sadly for me it was a biennial, just blooming in 2018, then, along with its neighbor the Blue Flax, returned to the dust from whence it came. That gorgeous blue and stunning orange were the highlights of my spring garden last year. I don't know yet if I have seedlings to carry on the tradition.

For Annieplantsny There is symbiotic or interdependent relationship between Light (sunlight), temperature, water, humidity and nutrients. You have to consider how a Meyer Lemon planted in the ground would grow and than mimic those conditions and seasons indoors. If the symbiotic relationship between Light, temperature, water, humidity, and nutrients are working at cross purposes indoors the plant will die quickly. You can't fertilize like spring, water like summer, light like January, and provide humidity like a desert. Your grow situation as described and considering your location is like growing in the darkest days of winter. A Meyer Lemon tree outdoors is fertilized from April-Sept. Fertilizer is than withheld from autumn through winter. Your adding fertilizer but the plant can't use the fertilizer because it does not have enough light this time of year. The fertilizer becomes toxic and you have leaf drop. Many people overwinter citrus in a basement or garage where it is cool and use little supplemental light. They get away with it because the plant is basically dormant and the growth occurs mostly outdoors. In an apartment the temperature is always too high and the humidity is always too low for the plant to go dormant. You need a vapor pressure deficit that is stress free. That is almost possible in an apartment unless you have a grow tent where you can raise humidity. Citrus are a lot like cannabis in light requirements. For an apartment I would recommend a grow tent with an LED rack light. When a citrus does not get the required light they are starved and they begin to consume themselves for energy. Your LED lighting gives off heat. Should not raise the leaf temperature more than 10F. Use an infrared thermometer to confirm you are not placing the light too close or too far away. The LED industry uses 10,000 Lumen per square foot as a benchmark for natural sunlight. If you can get 5000/sq foot indoors you are doing pretty good. This picture below is with a spectrum king Low Pro Flower plus. The light produces about 102,000 lumen. It is the equivalent of a 1000W Double Ended HPS Fixture. Had to turn the light down about 20% to keep the ballast running cooler and in turn that dropped the surface temperature of the leaves to about 10F above ambient. Currently running at 65 RH. When you do take your plant outside give it the TLC it needs and fertilize with a proper citrus fertilizer. They have specific macro and micro nutrients. Another way to visualize the growing seasons is to compare to swimming in a lake. If a lake is 50F but the ambient air is 80F than the swim is not that enjoyable. The same goes for your plants. If the pot soil is chilly and the leafs are burning up under artificial lighting the plant won't enjoy the experience. All the variables have to work together. Citrus are heavy feeders when they are growing. They like lots of compost.

Peren.all - Both, they bloom at about the same time. I can't add any more grasses. I have Geraniums [Cranesbill?] but they are edgers really and I wanted something either a little taller or shorter. I was wondering what would bloom at the same time. Bluestone has a good search feature that allows you to search by bloom time, I might try that. Also, my 2nd consideration is how they look in the late summer fall with their aging seed tops and the foliage getting red. I'm already planning on putting them near the Pennisetums that I have 'Hamelin' and 'Desert Plains'. The 'Desert Plains has nice fall color with some orange in there. Not as large as I like, but the larger Pennisetum I had, I ripped out last fall. It was a seedling nightmare. Worse than I've had with any other plant. I don't remember the variety. I have a corner I'm developing with Lilies/Perovskia/Gaura and I just saw a photo of a combination of Perovskia with Verbena bonariensis that I loved. I'm thinking of adding that to the mix and not sure if I will have room to add Penstemon. Here is the Perovskia/Verbena combo - I had one Verbena volunteer that reseeded into one of my vacant vegetable beds this summer and it turned into a huge circle and was the last thing blooming this fall. So I can bring that into my front bed with those plants.