What is likely to grow roots faster: a young rhododendron stem or an old, thick, sturdy one? And how long before they grow roots?

It's really very easy and less complicated than even this simple crochet rose. See crochet a granny square for full instructions with pictures on how to do this.

The soil can be reused; it is unlikely any of the roots will sprout new growth. If you are worried about it, pour boiling water on it to kill the...

Wait for roots to emerge before planting into soil, unless the soil in the pot can be kept moist (moist but free-draining) otherwise plant material will rot. It will not...

Strip it down to about 5 growing stems. Remove the lower leaves in July to help air circulation and feed with tomato food once a week (at half strength). Don't...

The best is to dig all around the plant and remove it from the ground. Then you can add sand in the hole and mix it with the clay.

It could be, it depends on your location. If the rock has a glass-like texture or if you can see rings in it, it is very likely to be obsidian.

Oats contain a form of gluten called avenin. Avenin can make the milk go "sticky" or thicken. Just change your ratio and add more liquids.

The sturdiness depends on how sturdy your outer circle is. If you are are still worried, try using card stock paper or very thin cardboard.

The tubers you may be referring to as dark and smooth may be the bulbs and bulbils of the plant, small divisional portions the plant grows to reproduce itself asexually,...

Yes, the seed pods are not developed. Plant the cutting and hopefully the pods will continue to develop. It takes about 8 months. They will turn dark and eventually split...