Answer: It isn't necessary to feed your newly planted shrubs. You want them to establish their root systems before they put on new top growth, and late fall is not a good time for them to be growing - cold weather could kill the new shoots before they have a chance to harden off.
In the spring, when active growth begins, you can feed your ceanothus and escallonia by broadcasting a granular fertilizer on the soil beneath each shrub. The amounts you'll use will depend upon the type of fertilizer you purchase (follow the label directions for amounts and frequency). I'd use a balanced general purpose garden fertilizer with an equal N-P-K ratio (such as a 10-10-10 or 20-20-20). Feeding once each spring should be all that's required for your new shrubs to grow and thrive.
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