Tuesday, January 31, 2023
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Develop Lights on Lemon Tree

Good day from VA,

We have had this potted lemon tree for a number of years however determined for the primary time to carry 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 effectively under freezing climate – down within the teenagers and 20s typically sufficient at evening.  Seemingly, due to this, the tree has at all times appeared a bit haggard and spindly – not very lush; it has six very slowly rising lemons.  In spring and summer season, it sits in a great sunny location, however I feel the chilly winters have taken a toll.

This yr we made the appreciable effort of bringing it inside – about 3 weeks in the past now – and to purchase and put it below develop lamps.  I have been fussing with simply the place to place the lights, how removed from the tree.  (I ought to word 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 Toes: 685μmol/m²/s
Colour 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 ideas.  However from my analysis, this is also brought on by different issues.  And oddly, a few of that yellowing and even the browning ideas occurred on leaves farther away from the lights.  (And the lumens from these lights drop off in a short time with distance).

Truthfully, I feel it simply might 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 couple of days in the past (it was lastly dry all the way 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 once we introduced it in, and it took a little bit of a shock in transition as effectively – a handful of leaves went yellow and dropped off.  It does seem like perking up possibly – many of the leaves are a light-green shade – not terrible wanting, 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 might 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 exterior, shock of coming in from exterior, now the develop lights, and fertilized for the primary time (and since it’s gradual launch, it could 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 one in all its heads goals straight towards the lemon tree as effectively (however about 20 inches away) – I’m solely studying about 3K Lx from it on the tree – however nonetheless, principally I’ve three lights aimed on the tree, all informed.  However the general avg. protecting the complete tree is prob. someplace round 2K lx or much less.  (For what it is value, the jade crops do not appear to thoughts the lights being nearer – actually, 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 except they’re proper up towards the plant?  The lights themselves delay little or no warmth – you’ll be able to put your hand proper up on the face of the bulbs and go away it there, i.e., heat to the contact, however by no means sizzling.

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

(The pics:  Within the first pic, you’ll be able to 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 seemed to be, however time will inform. 



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