Is this a lighting problem?
I'm growing sunflowers indoors, and starting a few others. They are the dwarf variety mainly and I'll give you some details of my setup so you can help.
Look at the picture:
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See on the newest leaves the bubbled up looking things?
Here's the deal. It's more brown in real life. It's more brown now because that picture is a day old. This one and one other flower have the same problem. The bumps are near the center of the leaves and close to the stem.
I want to know if this is from the lights or watering.
Could they be getting too hot? I've got a 4ft 40W 2 lamp fixture on them, color temp 6k on them and I've lined the inside of their home with aluminum foil and made reflectors of that too to keep a lot of light inside. The lamp doesn't get hot but maybe all that bouncing around is burning them? The lamp is maybe 7 inches from the plants.
Or is it watering? Am I over watering? I use a water bottle to water, I just poke a hole in the cap and squeeze. It used to do fine and I had precise control. But I read that after they start growing bigger sunflowers don't need as much water. Are they getting too much?
OR.. They've gotten kinda wide and still close to the soil so it's hard to water underneath them close to the stem. I usually end up getting a few drops of water on the plants themselves. They're small drops but compared to the plants they're huge. And the brown bubbled up spots are kinda where the water lands. I try to get the water off the plants in these cases but sometimes it's difficult, I don't want to hurt them.
What's your thoughts?