The more I play the hobby farmer, the more I firmly believe that if you are going to Bug Out in response to a cataclysm, it's better and easier to do it pre-TSHTF than to trying to once it starts to happen. Once it starts to happen, you are forced, by circumstance, to only to be able to act in certain ways; additionally, you are limited in what happens far after.
Think about it. You live in the middle of the city, you have a backpack, a car full of supplies an Emergency happens. You can choose to:
a) wait it through until it's obvious that your survival depends on you getting out
b) get out of there well before anything happens
c) listen to the local government or emergency services response advice.
Choice A: You wait too long, you can only get a small fraction of your supplies out as the roads are impassible - either blocked or flooded... all you can do is get out with what you can carry.
Choice B: You're jumping at your own shadow, and potentially putting yourself into worse problems.
Choice C: You forget that the people "leading" the response are humans, prone to human foibles, and may not know all the information... not to mention that you are leaving your life in their hands, absolving yourself of any responsibility for looking after your own safety.
The observant amongst you will point out to me the fact that, by choice of living in a semi-rural area, I am attempting to justify my own strategic planning - that may be the case.
On the other hand, I am finding a sizable chunk of my spare time taken up in all the work involved with getting a usable hobby farm going. While I admire the optimism of people who believe that they can do all this work, under the adverse conditions, and with the limited resources, that survival requires.
Plants take time to grow, and it is far better to get them growing when you have plenty of time, food, energy, and morale. Having some lemon seeds is not going to give you any lemons for a few years - never mind the fact that most citrus has to be grafted onto hardier rootstock to do well. Vegetables are quicker, no doubt, but still take time - especially if you're learning. In the long run, I do think that trees are going to be easier than annual crops for a varied diet - and give some more variety... yet grains, vegetables, and such are going to be necessary.
So... trees get planted, fertilised, pruned... especially in the spring.
Admittedly, I still have to consider the possibility of Bugging-Out to elsewhere... but I am in what would hopefully be a good position... You can't prepare for everything...