You will see that the leaves of an under-watered marijuana plants are firm and curling down because there is a lot of water to hold in its leaves. The leaves appear healthy but bent. The firmness of the leaves can be observed by touching it. The over-watered marijuana plant has a weak, bendy, and unhealthy leaves.
A compass needle's north point has to be attracted to the end of the Earth which it would on the actual Earth, and as the compass needle has north at the North end, that end is attracted to a south magnetic pole. (The capitalisation convention on this page is that geographical things have initial letter capitals (eg.
This you see as the north pole forming near the north pole of the solenoid. Like poles repel, unlike poles attract is kind of a misleading analogy(I find it strange that I realized this after reading your question). What actually is happening is that the tiny magnetic dipoles inside the magnetic material(a bar of iron, for example) align with the direction of the magnetic field.