Haworthias, Then and Now
Pagan
8 years ago
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Haworthia - Got one, now what?
Comments (14)Fluorescent lights are the best way to grow Haworthias, IMHO. I've been growing Haworthias under lights since the early 80's and the plants grow very symmetrically because the light is coming from directly above the plants; the plants don't end up leaning toward the light source as they do when grown in a window. The haworthias are a foot or less from the tubes and I have 3 - 2-tube fixtures above the plants, right next to each other. The light is quite strong, but not so strong it harms the plants in any way. My haworthias are also growing in my basement which is 50úF to 55úF at night and maybe 60úF to 65úF during the day. I've been surprised the plants grow as well as they do considering how cool the temperatures are. Don't put the plant right next to the tubes of a fluorescent fixture - 8" to 12" away is a good starting point and you can adjust the distance if needed (you may want to grow closer to the lights to bring out some of the rich colors the plants can take on when grown in intense light). I've not grown haworthias under Metal Halide or High Pressure sodium lights so you will have to experiment. I'm thinking you'll need to keep the plants 2 to 4 feet away from the light bulbs using high intensity lighting (just guessing). I grew orchids under HPS lights in my basement and they were about 3' away from the tubs and did very well, so you may need to keep the haworthias even farther away from the bulbs. I'm going to Yoga tonight, but I'll try to take a pic of one of the shelves of my light stand when I get home to show you some of my haworthias and the growth you can expect under fluorescent lights. If I get home too late tonight, I'll take the pic tomorrow. Good luck! Be careful, I started with just one haworthia and now I have between 40 and 50. They're addicting and you can grow a lot of them in a relatively small space. Mike...See MoreTips on Identifying between Chunky Echeverias and Haworthia?
Comments (8)I have two of these and earlier this year one of them sent up two spikes... first time after having this plant for years!!!! Of course, I was excited. Now my other plant has this flower. Because it is outside, it has been beaten up by the elements but still a nice flower for an Eche. I find they are somewhat slow growing (weather conditions, etc. might have some influence here) and a bit difficult to grow from leaves, but it is doable as demonstrated here. These are about a 1 ½ years old. Don't know why some Eches will produce a single new plant while other leaves from the same plant taken at the same time will grow multiple new heads. Then there is this cultivar of E. purpusorum, or at least this is the name that came with the plant several years ago. It obviously produces offsets! I've been meaning to clean it up this year......See MoreBudding succulents under lights
Comments (54)Thanks! One question I have for anyone who has set up grow lights: do you change your water schedule now that there is light on the plants full day? I've been watering everything once every 7-10 days (very small amounts of water for the Stapeliads) when they were in the windowsill without the lights. One thing I've noticed, is that the plants I water fully until they leak at the bottom drainage holes seem to be growing more (my small euphorbia poissonii, my 2 small dorstenias, my cubiformis and my larryleachia). I have been thinking about doing a full watering on the stapeliads instead of a couple teaspoons like I've been doing once a week, but I'm worried about rotting them. I'm debating whether two small waterings a week, or one full watering like I give the other small plants might help them grow and/or flower. They haven't done much growing if at all, unlike the others I mentioned above that get full water once a week. If anyone has any thoughts, especially with them all being under lights now, that'd be great! They're all in pure grit mix too (all the above plants), so maybe a full watering on all of them will be a better idea. Edit: Forgot to mention that with each water, I fertilize with Schultz Cactus+Succulent fertilizer. The greenhouse I got the cubiformis from said to do this on it since it's in pure pumice/rock mix so I did the same for everything in the mix....See MoreHaworthia question
Comments (10)Temperature should be cool - if it's too hot they just won't grow. Around 20C (68F) or so seemed pretty ideal for me. The average outdoor temperature is 25C (77F) now. We had an unusually hot summer this year with endless heat waves so my outdoor Haworthia were not doing much. The weather cooled down for almost two weeks (as of last week) and nearly all of them started to sprout inflorescences and new growth now. The average indoor temperature is 28C (82F) now and only a few of my Haworthia are flowering. They show the best growth spurts around 23C (73F) or lower, which I can tell because it depends on how low I set my thermostat and for how long. =) Light intensity should be bright, but not too much. If they get too stressed and turn too reddish/brownish/purplish, they won't grow as fast. I find this can be quite tricky to balance. The average DLI for my outdoor Haworthia grow area is now around 13 mol/m2/d (6000ftc / 63klux). I think this reading is a little low as I placed my sensor closer to the wall so it's easier to collect the data. This seems to be a good amount outdoors, considering the heat levels (which peak up to around 35-50C during the day and 15-20C at night). The hot daytime temperatures affects their growth. However, I find the night temperatures most critical in ensuring good growth. The average DLI for my indoor Haworthia grow area is now around 36 mol/m2/d (15.8kftc / 171klux). Although the average temperature in my home is cooler, the night time temperatures are not as good (33C peak, 24C low). So I find this hasn't triggered them to flower so much but is proving to be good for growth. Duration of light isn't something I've played with too much. My timers are kept in sync with local sunrise and sunset times. I find that temperature and light have a bigger role in Haworthia than light duration. However, other succulents such as my Mesembs are quite responsive to day duration and their flowers open/close in relation to that. Hopefully that helps give an idea? The numbers aren't that important really - that's my own growing conditions and what I've noted to correlate with periods of good growth. I think there is a lot of flexibility in growing conditions and it's up to you how you want to tweak or take advantage of them (or not, which is a perfectly acceptable choice too)....See MorePagan
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