See Exodus 3:8 note, and the contrast expressed in Deuteronomy 11:10-11, between Palestine and Egypt.
The physical characteristics and advantages of a country like Palestine must have been quite strange to Israel at the time Moses was speaking: compare Deuteronomy 3:25 note. To have praised the fertility and excellence of the promised land at an earlier period would have increased the murmurings and impatience of the people at being detained in the wilderness: whereas now it encouraged them to encounter with more cheerfulness the opposition that they would meet from the inhabitants of Canaan.
Vines - The abundance of wine in Syria and Palestine is dwelt upon in the Egyptian records of the campaigns of Thotmosis III. Only a little wine is produced in Egypt itself. The production of wine has in later times gradually ceased in Palestine (circa 1880’s).
For brass read copper (Genesis 4:22 note); and compare the description of mining operations in Job 28:1-11. Mining does not seem to have been extensively carried on by the Jews, though it certainly was by the Canaanite peoples displaced by them. Traces of iron and copper works have been discovered by modern travelers in Lebanon and many parts of the country; e. g., the district of Argob (see Deuteronomy 3:4 notes) contains iron-stone in abundance.