Wednesday, February 1, 2023
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Develop Lights on Lemon Tree

Hiya from VA,

We have had this potted lemon tree for a number of years however determined for the primary time to convey it in for the winter.  Beforehand we’d simply cowl it with burlap and drag in into our shed.  It’s managed to outlive 3 winters right here in northern VA despite the fact that we get loads of weeks of nicely beneath freezing climate – down within the teenagers and 20s typically sufficient at evening.  Doubtless, due to this, the tree has at all times regarded a bit haggard and spindly – not very lush; it has six very slowly rising lemons.  In spring and summer time, it sits in a superb sunny location, however I believe the chilly winters have taken a toll.

This 12 months we made the appreciable effort of bringing it inside – about 3 weeks in the past now – and to purchase and put it underneath develop lamps.  I have been fussing with simply the place to place the lights, how removed from the tree.  (I ought to be aware right here that the place the tree sits, in our basement, it will get little or no pure gentle, nearly negligible). 

I bought two of those twin head develop lights from Amazon: “Develop Mild with Stand, Lordem Full Spectrum LED Plant Mild for Indoor Crops, 200W Twin Heads.”
Listed below are the listed specs at Amazon:
Enter Energy: 60W
Lumen: 4500 lm
PF: >0.9
PPFD/1 Ft: 685μmol/m²/s
Coloration Temperature: 4000K
(Past this, the handbook merely says to maintain the lights at the least 9 inches away).

At first, I had the lights about 9 to 10 inches away from the highest of the tree on one facet, aiming down.  However I seen what *appeared* to be sunburn on some leaves – yellowing/ browning suggestions.  However from my analysis, this may be attributable to different issues.  And oddly, a few of that yellowing and even the browning suggestions occurred on leaves farther away from the lights.  (And the lumens from these lights drop off in a short time with distance).

Truthfully, I believe it simply could take a while to get it dialed in.  I watered and fertilized it (first time it is ever been correctly fertilized) with citrus fertilizer (Miracle-Gro Shake N’ Feed Citrus) a number of days in the past (it was lastly dry right down to about 3 inches into the soil after bringing it in).  A part of the issue is that the tree wasn’t in nice form after we introduced it in, and it took a little bit of a shock in transition as nicely – a handful of leaves went yellow and dropped off.  It does seem like perking up perhaps – a lot of the leaves are a light-green shade – not terrible trying, however not a lot deep inexperienced.  The tree did sprout 5 new buds down low on the rear – and these have been exploding, actually taking off – one good, wholesome signal.  However I would like to get some recommendation about these lights.  So, there’s a lot happening right here: tree by no means actually in nice form in first place/ survived a number of winters outdoors, shock of coming in from outdoors, now the develop lights, and fertilized for the primary time (and since it’s gradual launch, it might take a while to take impact).

I hoped to see or hear about different lime tree setups – see how shut others put their lamps of varied wattages or lumens output.  I’ve moved the lights additional away from the tree for now.  I’ve a light-weight meter app (who is aware of how correct).  And with the lights about 14 inches away, I measure about 9K lx on the closest leaves to *every* head.  However I’ve one other dual-head lamp that sits by a jade field subsequent to the lemon tree.  And certainly one of its heads goals straight towards the lemon tree as nicely (however about 20 inches away) – I’m solely studying about 3K Lx from it on the tree – however nonetheless, mainly I’ve three lights aimed on the tree, all advised.  However the general avg. overlaying your entire tree is prob. someplace round 2K lx or much less.  (For what it is price, the jade crops do not appear to thoughts the lights being nearer – the truth is, appear to love it finest with the lights about 9 or 10 inches away).

Is it even doable to burn this plant with these lights until they’re proper up towards the plant?  The lights themselves delay little or no warmth – you possibly can put your hand proper up on the face of the bulbs and depart it there, i.e., heat to the contact, however by no means scorching.

Thanks very a lot prematurely for studying and any recommendation, Gary in VA

(The pics:  Within the first pic, you possibly can see the present lamp placement with distances.  And within the second pic, a full shot of the tree with an arrow pointing to the brand new buds and one other arrow pointing to a department that broke on the backside that I taped up – thus the yellowing leaves on that department.  It has a lemon on the finish, and I hope there was sufficient pores and skin left on the department to heal up – there gave the impression to be, however time will inform. 



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