# Horticulture **URL:** https://forum.bonsaimirai.com/c/horticulture/5.md [Latest](https://forum.bonsaimirai.com/latest.md) · [Categories](https://forum.bonsaimirai.com/categories.md) --- ## [About the Horticulture category](https://forum.bonsaimirai.com/t/about-the-horticulture-category/13)
**Author:** [@system](https://forum.bonsaimirai.com/u/system)\ **Replies:** 2\ **Last updated:** [May 24, 2020, 12:24pm UTC](https://forum.bonsaimirai.com/t/about-the-horticulture-category/13 "2020-05-24T12:24:27Z")
Together, we can master this unique artform by combining our horticultural knowledge and experience. Talk soils, water, growth management, advanced techniques – dig into the nitty-gritty science behind bonsai practice an… --- ## [Soleirolia soleirolii Invasion](https://forum.bonsaimirai.com/t/soleirolia-soleirolii-invasion/13227)
**Author:** [@Roman](https://forum.bonsaimirai.com/u/Roman)\ **Replies:** 2\ **Last updated:** [September 27, 2026, 9:35pm UTC](https://forum.bonsaimirai.com/t/soleirolia-soleirolii-invasion/13227 "2026-09-27T21:35:59Z")
Hi everyone. I have an invasion of Soleirolia soleirolii (baby’s tears, angel’s tears). Does anyone know how to get rid of it without harming the bonsai? Manual removal is particularly difficult in rock plantings. … --- ## [Bald Cypress end of summer](https://forum.bonsaimirai.com/t/bald-cypress-end-of-summer/13235)
**Author:** [@topaz1850](https://forum.bonsaimirai.com/u/topaz1850)\ **Replies:** 2\ **Last updated:** [September 21, 2026, 5:45am UTC](https://forum.bonsaimirai.com/t/bald-cypress-end-of-summer/13235 "2026-09-21T05:45:46Z")
Hello Mirai community, particularly Bald Cypress fans. I placed my BC in a tray of water during mid summer when the temps were averaging 98-100\*. It did well but also put out a lot of roots from the pot into the water. … --- ## [Do you clean a juniper if it’s weak?](https://forum.bonsaimirai.com/t/do-you-clean-a-juniper-if-it-s-weak/13237)
**Author:** [@ForScience](https://forum.bonsaimirai.com/u/ForScience)\ **Replies:** 0\ **Last updated:** [September 20, 2026, 4:36pm UTC](https://forum.bonsaimirai.com/t/do-you-clean-a-juniper-if-it-s-weak/13237 "2026-09-20T16:36:22Z")
I repotted and old shimpaku this Spring and it will likely need another full year of recovery before I can style it. Signs: not using a lot of water No spiky growth yet For a tree that I want to leave alone while the… --- ## [Disease ID on Scots pine (Scandinavia)](https://forum.bonsaimirai.com/t/disease-id-on-scots-pine-scandinavia/13220)
**Author:** [@J\_L](https://forum.bonsaimirai.com/u/J_L)\ **Replies:** 3\ **Last updated:** [September 17, 2026, 9:25am UTC](https://forum.bonsaimirai.com/t/disease-id-on-scots-pine-scandinavia/13220 "2026-09-17T09:25:23Z")
Hello everybody, I’m in need of some help finding out what’s going on with this tree. The new growth from this year have been collapsing and hanging down, and the needles are shriveling and dying off. The tree was hap… --- ## [DiseaseID - white in hinoki needles](https://forum.bonsaimirai.com/t/diseaseid-white-in-hinoki-needles/13226)
**Author:** [@ForScience](https://forum.bonsaimirai.com/u/ForScience)\ **Replies:** 2\ **Last updated:** [September 14, 2026, 3:04am UTC](https://forum.bonsaimirai.com/t/diseaseid-white-in-hinoki-needles/13226 "2026-09-14T03:04:09Z")
Is this just my foliar pesticide spray drying or à problem? I don’t water overhead and it rarely rains. --- ## [White pine elongation](https://forum.bonsaimirai.com/t/white-pine-elongation/13221)
**Author:** [@Burslf](https://forum.bonsaimirai.com/u/Burslf)\ **Replies:** 2\ **Last updated:** [September 12, 2026, 7:08am UTC](https://forum.bonsaimirai.com/t/white-pine-elongation/13221 "2026-09-12T07:08:46Z")
Does this look like candle extension or just a new bud. It’s beginning autumn here in uk and I wouldn’t expect to see this extension now. If it is extension any thoughts on cause or special care over winter. I’d be worri… --- ## [Cleaning operation on a weak tree](https://forum.bonsaimirai.com/t/cleaning-operation-on-a-weak-tree/13214)
**Author:** [@ForScience](https://forum.bonsaimirai.com/u/ForScience)\ **Replies:** 0\ **Last updated:** [September 6, 2026, 6:22pm UTC](https://forum.bonsaimirai.com/t/cleaning-operation-on-a-weak-tree/13214 "2026-09-06T18:22:09Z")
I have a shimpaku which got replted this year. It is fairly weak after the first growing season doesn’t use that much water No spiky growth yet but the energy balance is all messed with dense pads, unevenly distribute… --- ## [Yamadori Siberian Elm Raft](https://forum.bonsaimirai.com/t/yamadori-siberian-elm-raft/13209)
**Author:** [@Joshua\_Howe](https://forum.bonsaimirai.com/u/Joshua_Howe)\ **Replies:** 2\ **Last updated:** [August 30, 2026, 12:50am UTC](https://forum.bonsaimirai.com/t/yamadori-siberian-elm-raft/13209 "2026-08-30T00:50:39Z")
First time posting! So I collected this natural raft from the parking lot of my woodshop. It had fallen over years ago and was growing on top of the asphalt and under a bunch of leaf litter from the tree above it (also S… --- ## [Hinoki Browning Tips](https://forum.bonsaimirai.com/t/hinoki-browning-tips/2638)
**Author:** [@ryan.marin](https://forum.bonsaimirai.com/u/ryan.marin)\ **Replies:** 12\ **Last updated:** [August 23, 2026, 8:59pm UTC](https://forum.bonsaimirai.com/t/hinoki-browning-tips/2638 "2026-08-23T20:59:09Z")
Hey All, I am a little concerned about some browning tips on a hinoki cypress in my collection. Any guidance would be great! Thanks! This pic shows some of the healthier foliage. This is some of the worst affected… --- ## [Timing for hard pruning of elongating species](https://forum.bonsaimirai.com/t/timing-for-hard-pruning-of-elongating-species/13185)
**Author:** [@Chibon](https://forum.bonsaimirai.com/u/Chibon)\ **Replies:** 7\ **Last updated:** [August 12, 2026, 1:38pm UTC](https://forum.bonsaimirai.com/t/timing-for-hard-pruning-of-elongating-species/13185 "2026-08-12T13:38:40Z")
Was wondering what is the best time for a first heavy structural pruning and wiring of elongating species. I have read several things with different explanations: Early spring as buds are breaking - tree is in growth m… --- ## [Direct sunlight question](https://forum.bonsaimirai.com/t/direct-sunlight-question/13183)
**Author:** [@BonsaiCubsFan1955](https://forum.bonsaimirai.com/u/BonsaiCubsFan1955)\ **Replies:** 2\ **Last updated:** [August 9, 2026, 3:44pm UTC](https://forum.bonsaimirai.com/t/direct-sunlight-question/13183 "2026-08-09T15:44:09Z")
Hi all, I’m curious about just how much direct sunlight a tree needs. I do know that it depends on the species, climate, and so on, but that being the case, it seems that most outdoor trees do fine in a mix of shade an… --- ## [Why am I getting these little black spots and tiny leaves on jade? I’m in South Florida and water once a day unless it rains, I’m conscious of not overwatering](https://forum.bonsaimirai.com/t/why-am-i-getting-these-little-black-spots-and-tiny-leaves-on-jade-i-m-in-south-florida-and-water-once-a-day-unless-it-rains-i-m-conscious-of-not-overwatering/13186)
**Author:** [@Dluigi63](https://forum.bonsaimirai.com/u/Dluigi63)\ **Replies:** 5\ **Last updated:** [August 7, 2026, 6:30pm UTC](https://forum.bonsaimirai.com/t/why-am-i-getting-these-little-black-spots-and-tiny-leaves-on-jade-i-m-in-south-florida-and-water-once-a-day-unless-it-rains-i-m-conscious-of-not-overwatering/13186 "2026-08-07T18:30:32Z")
--- ## [Brown tips on a Hinoki Cypress](https://forum.bonsaimirai.com/t/brown-tips-on-a-hinoki-cypress/13182)
**Author:** [@BonsaiCubsFan1955](https://forum.bonsaimirai.com/u/BonsaiCubsFan1955)\ **Replies:** 0\ **Last updated:** [August 3, 2026, 11:46pm UTC](https://forum.bonsaimirai.com/t/brown-tips-on-a-hinoki-cypress/13182 "2026-08-03T23:46:12Z")
I know this came up in 2019, but curious if the browning on the very tip of my Hinoki Cypress could be due to too much water? --- ## [Best pot and soil mix for seedlings](https://forum.bonsaimirai.com/t/best-pot-and-soil-mix-for-seedlings/13175)
**Author:** [@Szafran](https://forum.bonsaimirai.com/u/Szafran)\ **Replies:** 4\ **Last updated:** [August 1, 2026, 7:14am UTC](https://forum.bonsaimirai.com/t/best-pot-and-soil-mix-for-seedlings/13175 "2026-08-01T07:14:51Z")
Hi everyone, I would appreciate some advice on the correct development stage for my Japanese yew seedling. I bought it as a young nursery plant growing in its original nursery soil. Being inexperienced, I probably rush… --- ## [Randy Knight woodchips method](https://forum.bonsaimirai.com/t/randy-knight-woodchips-method/13177)
**Author:** [@Chibon](https://forum.bonsaimirai.com/u/Chibon)\ **Replies:** 0\ **Last updated:** [July 30, 2026, 3:19pm UTC](https://forum.bonsaimirai.com/t/randy-knight-woodchips-method/13177 "2026-07-30T15:19:51Z")
Recently saw the Randy Knight Yamadori aftercare video where he mentions using a bed of woodchips for new yamadori recovery. It sounds like he puts the tree on the ground and then makes a berm of woodchips around the roo… --- ## [Yamadori advice](https://forum.bonsaimirai.com/t/yamadori-advice/12323)
**Author:** [@KurtisM](https://forum.bonsaimirai.com/u/KurtisM)\ **Replies:** 14\ **Last updated:** [July 25, 2026, 10:37pm UTC](https://forum.bonsaimirai.com/t/yamadori-advice/12323 "2026-07-25T22:37:44Z")
Hi all, I’ve been given permission to did this Lonicera stump near my work. It is roughly 6 inches wide at it’s thickest that is above the soil line. I have noticed a thick root a good foot below the trunk, do I did a… --- ## [Dormancy Spray/ Fungus](https://forum.bonsaimirai.com/t/dormancy-spray-fungus/13164)
**Author:** [@Nickljohnson80](https://forum.bonsaimirai.com/u/Nickljohnson80)\ **Replies:** 3\ **Last updated:** [July 21, 2026, 1:49am UTC](https://forum.bonsaimirai.com/t/dormancy-spray-fungus/13164 "2026-07-21T01:49:44Z")
Hello all. I’m looking for advice on dormancy sprays. What should I use and is it sprayed only on the foliage? Living up here in NW Montana we have harsh winters and very long wet springs. I’m realizing fungal issues a… --- ## [Post-flush harden pruning on short needle single flush pines](https://forum.bonsaimirai.com/t/post-flush-harden-pruning-on-short-needle-single-flush-pines/13144)
**Author:** [@mff321](https://forum.bonsaimirai.com/u/mff321)\ **Replies:** 2\ **Last updated:** [July 5, 2026, 10:50pm UTC](https://forum.bonsaimirai.com/t/post-flush-harden-pruning-on-short-needle-single-flush-pines/13144 "2026-07-05T22:50:43Z")
So am I correct in my understanding that with short needle single flush pines, you can in the post flush harden time period (say mid-June in Portland) prune new shoots back to desired length, leaving some of the new need… --- ## [Overwatering in the heat](https://forum.bonsaimirai.com/t/overwatering-in-the-heat/13149)
**Author:** [@Chibon](https://forum.bonsaimirai.com/u/Chibon)\ **Replies:** 3\ **Last updated:** [July 5, 2026, 10:44am UTC](https://forum.bonsaimirai.com/t/overwatering-in-the-heat/13149 "2026-07-05T10:44:19Z")
Very hot and humid lately in the midwest (90s for several straight days). Been watering and misting frequently. Was wondering if this can lead to overwatering? The trees are getting pretty hot out in the sun, but not rea… --- ## [Fungal issue on cryptomeria?](https://forum.bonsaimirai.com/t/fungal-issue-on-cryptomeria/13094)
**Author:** [@Makoto3839](https://forum.bonsaimirai.com/u/Makoto3839)\ **Replies:** 13\ **Last updated:** [June 30, 2026, 2:03am UTC](https://forum.bonsaimirai.com/t/fungal-issue-on-cryptomeria/13094 "2026-06-30T02:03:40Z")
My cryptomeria is getting brown parts on some of the foliage but then continuing to grow new green tips. The orangish brown foliage isn’t dry, just discolored but feels the same to the touch as the healthy green foliage … --- ## [Japanese Black Pine declining after repotting — possible root rot, fungus or pests?](https://forum.bonsaimirai.com/t/japanese-black-pine-declining-after-repotting-possible-root-rot-fungus-or-pests/13134)
**Author:** [@florian\_sticher](https://forum.bonsaimirai.com/u/florian_sticher)\ **Replies:** 3\ **Last updated:** [June 23, 2026, 5:09pm UTC](https://forum.bonsaimirai.com/t/japanese-black-pine-declining-after-repotting-possible-root-rot-fungus-or-pests/13134 "2026-06-23T17:09:52Z")
Hi everyone, I’m worried about my Japanese Black Pine and would really appreciate some advice. A few months ago, one branch lost all of its needles and now seems mostly dead. More recently, I repotted the tree because … --- ## [Field maple development](https://forum.bonsaimirai.com/t/field-maple-development/13135)
**Author:** [@Kami1987](https://forum.bonsaimirai.com/u/Kami1987)\ **Replies:** 3\ **Last updated:** [June 19, 2026, 11:05pm UTC](https://forum.bonsaimirai.com/t/field-maple-development/13135 "2026-06-19T23:05:34Z")
Hi all just a confirmation of learning here I have a Yamadori field maple that started as a stump and I have started growing out the primary branches cutting back growth in the upper half of the tree to push energy in… --- ## [Summer nutrition](https://forum.bonsaimirai.com/t/summer-nutrition/13131)
**Author:** [@Chadrock2643](https://forum.bonsaimirai.com/u/Chadrock2643)\ **Replies:** 4\ **Last updated:** [June 16, 2026, 1:00pm UTC](https://forum.bonsaimirai.com/t/summer-nutrition/13131 "2026-06-16T13:00:07Z")
I am wondering, as a general rule of thumb, what nutrients should be given to trees during summer? I know salts are to be avoided but, hearing summer nutrition is upmost important since apical came into play, what specif… --- ## [Yellow pine needles](https://forum.bonsaimirai.com/t/yellow-pine-needles/13133)
**Author:** [@chris\_anderson](https://forum.bonsaimirai.com/u/chris_anderson)\ **Replies:** 0\ **Last updated:** [June 16, 2026, 4:25am UTC](https://forum.bonsaimirai.com/t/yellow-pine-needles/13133 "2026-06-16T04:25:11Z")
I have these two pines trees no certain the variety. The needles have a sandy texture so I don’t know if that helps identify them . Any how the one on the left seems to have a strange trate the new growth is yellow. It g… --- ## [Juniper browning](https://forum.bonsaimirai.com/t/juniper-browning/12663)
**Author:** [@SpiderMeat](https://forum.bonsaimirai.com/u/SpiderMeat)\ **Replies:** 2\ **Last updated:** [June 14, 2026, 6:03am UTC](https://forum.bonsaimirai.com/t/juniper-browning/12663 "2026-06-14T06:03:28Z")
Hello, my shinpaku juniper is showing some browning, mostly tips but some of the smaller branches entirely. I will admit this I started the early spring (a month or so ago) heavy watering probably daily and I think that… --- ## [Juniper showing browning](https://forum.bonsaimirai.com/t/juniper-showing-browning/11913)
**Author:** [@Maikeru](https://forum.bonsaimirai.com/u/Maikeru)\ **Replies:** 12\ **Last updated:** [June 11, 2026, 11:10pm UTC](https://forum.bonsaimirai.com/t/juniper-showing-browning/11913 "2026-06-11T23:10:55Z")
Hi all, I have this procumbens nana and it’s expressing problems. The color is changing here and there. On the other hand it’s showing new healthy tips and new crotch growth. It’s been in this container for a bit more … --- ## [Japanese maple fairy hair](https://forum.bonsaimirai.com/t/japanese-maple-fairy-hair/13120)
**Author:** [@Kenez](https://forum.bonsaimirai.com/u/Kenez)\ **Replies:** 0\ **Last updated:** [June 5, 2026, 12:47pm UTC](https://forum.bonsaimirai.com/t/japanese-maple-fairy-hair/13120 "2026-06-05T12:47:00Z")
Has anyone tried to bonsai a fairy hair maple? If so any thoughts? --- ## [Placement - on ground or on flat surface?](https://forum.bonsaimirai.com/t/placement-on-ground-or-on-flat-surface/13113)
**Author:** [@Chibon](https://forum.bonsaimirai.com/u/Chibon)\ **Replies:** 4\ **Last updated:** [May 31, 2026, 11:46pm UTC](https://forum.bonsaimirai.com/t/placement-on-ground-or-on-flat-surface/13113 "2026-05-31T23:46:09Z")
After repotting nursery stock into training pots, I put them directly on the ground, as I understand the stability of temps is good for the roots. After 6-8 weeks they are doing fine, and recovered/recovering well. Howe… --- ## [Question for the void](https://forum.bonsaimirai.com/t/question-for-the-void/13115)
**Author:** [@KurtP](https://forum.bonsaimirai.com/u/KurtP)\ **Replies:** 1\ **Last updated:** [May 31, 2026, 9:30pm UTC](https://forum.bonsaimirai.com/t/question-for-the-void/13115 "2026-05-31T21:30:04Z")
Two summers ago, I switched to a new cube of genuine New Zealand … sphagnum moss. That summer started to see this large green lichen like stuff. About the size of an American quarter This year, it is everwhere…even huge… [Next page](https://forum.bonsaimirai.com/c/horticulture/5.md?page=1)