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it's because you are watering it to much
It is common for a newly planted lemon tree to drop its fruit; it will take a few years for its root-system to be developed.
Should a newly planted tree have the lower branches cut to encourage faster growth?
Yes .
Move it.
Yes they will eat the lower new leaves and ones higher up too if they can get at them. They will also have a chew at the bark and if left to their own devices will ruin a newly planted hedge. Hares will decimate a newly planted hedge. They chop off the stems and strip the bark. If either beasts are attracted to a newly planted hedge fence it with chicken wire--both sides.
4th
depends on how much damage it took
You have to water the garden, so that the seeds can have enough nutrients to start off.
No. Dragonflies are purely carnivorous, they eat smaller insects.
every 3 days for the first month
Because it's roots weren't deep enough to reach the water in the soil. Use native grasses with deeper roots, like fine fescues, instead of Kentucky blue. Fescue roots go down 6 inches while Kentucky blue struggles to get 2 inch roots. The deeper the roots, the less you will have to water too.